Upon collecting them from the class, she will run a correlation between the scores on the two versions to determine the level of ___________ reliability. If a research hypothesis posits that there is a direct relationship between two variables, the test is _____. a. Select one: c. Negative Students also viewed. The number of degrees of freedom is Which of the following is the Greek letter rho? The square of the Pearson product-moment correlation coefficient O positive correlation univariate correlation neutral correlation o negative correlation 2) The equation of a wave along the x-axis is given as: cm = 3.4 sin (1.13 x - 0.75 t) in which is the displacement. False, If two variables are significantly correlated, this means that one variable causes the other. a. 35% Select one: The product of the two regression coefficients bxy and byx is equal to. The coefficient of determination, R 2, is 54.0%. a. d. Indirect correlation, The coefficient of determination is equal to: In the equation r(65) = .45, p < .05, what does r represent? In the following, what is the number of .01: t(58) = 5.015, p < .01? Write the equation for the null hypothesis. Nonparametric statistics are known as _______. Which of the following indicates a significant correlation? d. the critical statistic, 14. a. null hypothesis b. t statistic c. mean difference d. research hypothesis. What can the researcher conclude? grade level academic performance television viewing students . O N-k O (n-1)=k n-1 O k-1 Analysis of variance A _____________ is when there is more than one independent variable to predict an outcome. c. the test statistic The outcome variable, or the variable that is predicted, in a regression analysis. d. .80, If the correlation between variables is .60, what is the coefficient of alienation? What three questions can you answer by doing a 2 x 2 factorial analysis? d. Unknown, When adding additional predictors to a regression analysis, you should try to find predictors that are related to _____________ but not ______________. a. 16. Now use Excel to count the number of data points, n. (To do this, use the Excel COUNT () function. b. - look at relationships, or associations, between variables, - Pearson product-moment coefficient of correlation b. Biserial correlation If a simple Pearson correlation value = .512, what percentage of variance is ACCOUNTED for? The test statistic for the t test for the correlation coefficient is equal to, 11. When the products are more stable than the reactants, Gorxn is negative, and the reaction is exergonic. c. Predictor variable Question 20 1 pts The correlation between the two variables of interest is .81, which is significant at the .0637 level. d. Predictor score, Based on the formula for a regression line, what does a represent? a. one tailed b. two tailed c. direct d. positive. The obtained value (.213) is less than the critical value (.2875) so it cannot be concluded that the relationship between the two variables occurred by something other than chance. The meaning of RXY abbreviation is "Stability Coefficient of X and Y". Question 1 1 pts A researcher is looking at the correlation between depression and anxiety using a two-tailed test with an alpha level of .05. 49% When data points group together in a cluster from the upper left-hand side of the xy axis to the lower right-hand side, what is this? a. number of pairs used to compute the correlation coefficient True - the predicted score or criterion, - independent (predictor) variable -.24 If your analysis notes that participants in a weight loss study differ in amount of weight lost based on the type of weight loss program used, what type of effect is this called? a. p = .049 (Provide your answer in dollars and in percentage.) Which of the following is the Greek letter rho? When you have more than one factor, what type of ANOVA should be used? Independent c. parallel forms If a simple Pearson correlation value=.75, what percentage of variance is accounted for? What kind of test should she use? In a recent (LMCS,p.317) V.1 First{OrderLogic Thisisthemostpowerful,mostexpressive logicthatwewillexamine. The range is -1 to 1 rxy = -0.81 represents a strong inverse relationship. a. Steps 3 and 4: Select the appropriate test statistic What is the formula for the degrees of freedom for the t test for the correlation coefficient? False. ^ = r XY s Y s X, where s Y and s X are the sample standard deviation of Xand Y, and r XY is the correlation between Xand Y. is used to predict a Y score from an X score. For the following regression line, Y' = 0.75X +1, what is the Y' when X = 2? .80 Will Mary need to use the services of a freight forwarder? RXY stands for "Stability Coefficient of X and Y". Negative correlation a. Select one: with means X and Y. The P in the null hypothesis represents the _______ of occurrences in any one category. 47% True Select one: Write an example of a research hypothesis for a two-tailed t-test for the correlation coefficient. d. Negative correlation, The correlation coefficient is a measure of __________. d. .754, If a research hypothesis does not predict the direction of a relationship, the test is __________. Write the number in scientific notation. How many null hypotheses are associated with a Two-Way ANOVA? If a research hypothesis posits that there is a direct relationship between two variables, the test is __________. 15. Question 14 1 pts John is examining study habits and finds that as students spend more time studying, their test scores are also higher. Ourversionofrst-orderlogicwillusethe followingsymbols: Correlation coefficients examine the relationship between variables. (T/F), The correlation coefficient can only be used for one-tailed tests. students grade level degree of parent involvement O parents Which of the following would be an example of a design that examines the effects gender and SES ( high SES and low SES) on a test of student achievement? Which of the following formulas is used to calculate degrees of freedom for a dependent-samples t-test? - r2 x 100 What are the three null hypotheses used in a 2 x 2 factorial analysis? 49.6% Select one: We estimate this by computing the variance within each of the treatment conditions and taking the mean of these variances. d. b, Which of the following symbols is associated with the y-intercept in the regression equation? a. Select one: b. 3. .36 b. Note that independent variables have 0 correla-tion as well as 0 covariance. Very high a. Select one: False, Which of the following symbols is associated with the slope in the regression equation? a. c. Negative correlation It simply means that there is absence of linear relationship between x and y. the variables may be related in same other form quadratic, logarithmic, exponential or . Next, a partial correlation is the correlation between an independent variable and a dependent variable after controlling for the influence of other variables on both the independent and dependent variable. False, The standard error of estimate tells you how much imprecision there is overall in regard to the predictive power of the linear regression analysis. Test-retest is the correlation of scores at two points in time. a. If r(exercise / weight) = -0.87, which of the following statements is NOT true? B. If your analysis notes that participants in a weight loss study differ in amount of weight lost based on their gender, what type of effect is this called? If b = -.75, the correlation between X and Y is, If the regression line has a negative slope, b would be, 25. 3. there is no interaction between the two factors. On April 2, Dawson purchased merchandise on credit for$28,200 with terms 3/15, n/25. Repeated measures The research hypothesis posits that the treatment will result in an outcome greater than zero (H1: rxy > 0.) b. research hypothesis t statistic mean difference null hypothesis b. and level of parent involvement, what is the dependent variable of interest? c. -.66 b. Slope of a line \hline a. A correlation coefficient can inly test one variable at a time. elation In general, both sets of data False, A significant correlation does not indicate causality. a. Q5. D. A z-score of -3 and +3 are the exact same distance from the population mean. Some of the important points covered in this chapter are concept of charge, concept of current, concept of potential and potential difference, concept of resistance, ohm's law. c. Standard error of the estimate The most common correlation coefficient, generated by the. d. Negative correlation, The more oatmeal you eat, the lower your blood cholesterol level is an example of a ____________. If a research hypothesis posits that there is a direct relationship between two variables, the test is, 9. t test for correlation coefficient null hypo, t test for coorelation coefficient research hypo, h1: p1 (not equal) p2 (not equal) p3 (not equal) p4, Statistical Techniques in Business and Economics, Douglas A. Lind, Samuel A. Wathen, William G. Marchal, The Practice of Statistics for the AP Exam, Daniel S. Yates, Daren S. Starnes, David Moore, Josh Tabor, Mathematical Statistics with Applications, Dennis Wackerly, Richard L. Scheaffer, William Mendenhall, Daniel S. Yates, Daren S. Starnes, David Moore, Re-write each function in simplified form (without common factors) Be sure to give the domain of each function. 27 In the formula that computes a t value, what does X _1 represent? The dependent variable for the study was the number of free throws made out of ten shots. $\\$$y=$$\frac{3}{2} x+1$. c. .19 In the result _((3))^2=8.4,p< .05, what is 3? A multivariate analysis of variance uses two or more dependent variables, and a univariate analysis of variance only uses one dependent variable. a. t-test - point at which the line crosses the y-axis, - The measure of how much all of the data points (on average) differs from the predicted data point; in essence, the standard deviation of all of the error scores, - "R" c. Exercise causes weight loss. Cost for 75 kWh of energy = 4.20 75 = 315. 18. d. A vertical line, If the correlation between two variables was equal to 0, the scatterplot between these two variables would be represented as: Another term for the predictor is the ____________ variable. c. A horizontal line Direct correlation When computing a correlation coefficient, if you have 27 degrees of freedom, your sample size must be _______. The correlation coefficient ( ) is a measure that determines the degree to which the movement of two different variables is associated. A correlation is simply defined as a relationship between two variables. The syntax for COUNT () in this example is: =COUNT (B3:B8) and is shown in the formula bar in the screen shot below. rxy' = the corrected correlation of test score "x" with test score "y". a. b. Y' In ANOVA, you have an interaction effect when: The effect of one independent variable differs based on the level of a second independent variable, If you find that income significantly varies on the basis of gender, you have. She would do this to run a correlation between the two administrations to determine the level of ________________ reliability. 1. a. 2.97 If there are three categories for which you are calculating a one-sample chi-square, what are the degrees of freedom? a) sx = 4, sy = 9 b) rxy = 0 c) sx= 2, sy = 3 d) rxy =1/2 e) rxy =1/4. Thus, it measures the degree of dependence of one variable on the other (s). 49% As such, a statement is an assertion that something is or is not the case. Select one: Which of the following represents the test statistic for a correlation coefficient? The relationship between the variables is strong. The coefficient of determination is r^2. 2. c. a b. Dependent variable b. What would be concluded for r(29)= .467, p < .05? x2468y10203040\begin{array}{|c|c|c|c|c|} 1 XY 1: There are various ways you can prove that in-equality. Determine the wavelength. If b = .90, the correlation between X and Y is, 23. the population estimate of the correlation coef, if a research hypothesis posits that there is an indirect relationship between two variables, the test is, if a research hypothesis posits that there is an direct relationship between two variables, the test is, If a research hypothesis does not predict the direction of a relationship, the test is, The test statistic for the t test for the correlation coefficient is equal to, a. number of pairs used to compute the correlation coefficient. - Use that correlation and the knowledge of X to predict Y with a new set of data. What is the formula for the degrees of freedom for the t test for the correlation coefficient? Solve the equation by finding square roots. c. One-tailed True False . If a simple Pearson correlation value = .362, what percentage of variance is unaccounted for? b. Question: 1) Is ryx = rxy? b. p < .05. c. .66 O It cannot be determined. Mean differences Select one: 1. there is no difference between the levels of the first factor 44% Which of the following is an example of a null hypothesis for testing a correlation coefficient? b. The independent variable, the dependent variables With regard to the one-sample chi-square test, the categories must be. b. Participants who imagined shooting baskets made an average of 5.00 free throws (SD = 1.26) 3. -1.0 to 1.0. c. -2.0 to 2.0. d. -3.0 to 3.0. a. Correlation and Trends, Page 3 Let rt be defined as the critical value of rxy.It is evaluated as () 2 /2 2 /2 df t kt r kt = +, where o k is the number of independent variables used in the correlation. The research hypothesis is accepted. In 2's complement we can represent -2^(n-1) to 2^(n-1) -1 20 = 2^(n-1) -1 n = 6 bits Assume we want to address 20 locations in both directions, how many bits are required for an instruction to specify the offset in PC-relative offset addressing mode? b. a. null hypothesis b. t statistic c. mean difference d. research hypothesis. Question 4 1 pts Sarah is interested in whether the extent to which parents are involved in their children's school differs based on students' grade in school (i.e., first, second, third, etc.). $$ c. No correlation d. Slope, Using the regression formula with a slope = .704 and intercept = .719, what would the predicted college GPA be for a student whose current high school GPA = 3.2? She writes two tests and uses both versions for the midterm. 68% If the critical value is less than the obtained value, what should you do? Q4. A line sloping upwards d. .65, Which of the following correlations would be interpreted as a weak relationship? b. Which of the following is NOT a type of reliability? Finally, use the above components and the linear regression equations given in the previous section to calculate the slope (m), y . .35 (H1: rxy > 0.) False, Correlations can be used to examine the differences between groups. b. Pearson's product-moment correlation coefficient is represented by the following letter: What would you use to visually represent a correlation? 483,900,000 miles. (b) Find the autocorrelation of the output Yn when Xn is a wide sense stationary random sequence with X = 0 and autocorrelation RX [n] = c. Linear regression When computing a correlation coefficient, if you have the degrees of freedom of 36, your sample size must be: A single correlation can be computed in order to determine the relationship between three variables. -.26 Also sometimes called a "net income statement" or a "statement of earnings," the income statement is one of the three most important financial statements in . Select one: c. Prediction Example: -1.0 denotes a perfect negative correlation. If the correlation between two variables is .496, what is the coefficient of determination? 3) Should the estimated correlation be extrapolated beyond the observed ranges of . 36% (T/F), If two variables are significantly correlated, this means that one variable causes the other. 18. means that as the value for one variable becomes larger, the value for the other variable also tends to increase. A type of regression in which more than on independent variable is included in the analysis. States your organization's bold vision for the future and why that is important. Observed statistic The line that best fit that is drawn (or calculated) based on on the values in the regression equation. There is a significant negative relationship between depression and anxiety in this sample. Study with Quizlet and memorize flashcards containing terms like 1. b. test-retest a. And, the closer r is to 1, the stronger the positive linear relationship. If r(exercise / weight) = -0.87, which of the following statements is NOT true? You determine that you should ______. In a one-sample chi-square test, if your respondents are distributed very unequally across the levels of your variable, your chi-square value will be _______. 38. If the correlation between two variables is .496, how much of the variance has not been accounted for? Give three examples of types of reliabilities that use correlation coefficients and explain what they are used for. The Gift Shoppe has a continuous income stream with an annual rate of flow at time ttt given by, G(t)=30,000(dollarsperyear)G(t)=30,000 \quad \text { (dollars per year) } 29 If we do not have this information (the reality more often than not), we can still conduct the hypothesis test. Helps define the area where you play. The null hypothesis in an independent-samples t-test would be represented as follows: In the t-test for independent samples, the actual statistical test is _______. b. Direct correlation We can interpret the y-intercept to mean that when there is zero forested area, the IBI will equal 31.6. You could remind your classmate that although the correlation was strong, and much of the variance was accounted for by confidence, confidence still does not cause college success. This chapter illustrates that you can also incorporate ___________ into the correlation coefficient. b. We follow standard hypothesis test procedures in conducting a hypothesis test for the population correlation coefficient . a. Two-tailed Select one: Two-tailed. You run a t-test and find that your results indicate that t(38) = 4.15, p < .05. Question 2 5 pts A researcher is interested in examining whether different practice strategies have an influence on the accuracy of basketball players' free throws. A question on the Minnesota Multiphasic Personality Inventory (MMPI) such as "I get angry sometimes" is included to determine what about the test-taker? d. Line of the estimate, What is the distance between each data point and the regression line called? y=-2 sin x, Solve for t in each of the following compound interest equations. When determining the degrees of freedom, n is equal to the b. A capacitor is an electronic device that stores an electrical charge. 1. b. research hypothesis. a. What is plane geometry? Prepare journal entries for these four transactions. Select one: When analysis of data reveals differential effects of one factor across levels of another factor, what is this called? b. d. 74%, If a simple Pearson correlation value = .685, what percentage of variance is accounted for? - Variance that is specific to other Select one: d. Whether the person has a stronger id or superego. Select one: 19.93 17 15 If variables change in the same direction, what type of correlation is this called? c. .64 For linear correlation with only one independent variable, k = 1. Select one: 4) Is the sample correlation. a. By dividing by the product X Y of the stan-dard deviations, the correlation becomes bounded between plus and minus 1. "Stability Coefficient of X and Y" can be abbreviated as RXY. Select one: What is another term for a negative correlation? a. Regression coefficient is a statistical measure of the average functional relationship between two or more variables. a company that sells flight insurance provides $100,000 in case of death in a plane crash. b. a. d. Correlations having lower values, if the absolute value of your correlation coefficient is 1, your error in prediction will be: There is a significant positive relationship 2. df between groups = 3-1 = 2 df within groups = 18-3 = 15 MS between = SS between / d. 1. - the score being used as the predictor, - slope d. Both B and C, The higher the absolute value of the correlation coefficient, the less accurate the prediction is of one variable based on the other variable. a. p = .21 E(X(t)) = 0 and RX(t1,t2) = 1 2 cos(t2 t1), thus X(t) is WSS But X(0) and X( 4) do not have the same pmf (dierent ranges), so the rst order pmf is not stationary, and the process is not SSS For Gaussian random processes, WSS SSS, since the process is completely specied by its mean and autocorrelation functions Which of the following answers are correct? Which of the following Greek symbols is used to represent the population estimate for a correlation coefficient? The answer depends on what you mean by "predict". Continuous correlation c. n - 3 a. If there is almost no difference between what is observed and what is expected, your chi-square value will be _______. Select one: If a research hypothesis posits that there is a direct relationship between two variables, the test is _______. c. a Suppose sunrise causes you to wake up. Case in point, humans are hard to predict. What does it indicate if r = -1.00? (d) It can be meaningless to try to interpret 0 because The intercept coecient 0 measures the mean value of y when x equals zero. 1. d. Critical statistic, In the equation r(65) = .45, p < .05, what are the degrees of freedom? If rGPA and SAT = .79, then we could predict the SAT score to be __________ if the GPA is high. c. Nominal-level Select one: Which of the following is another use of correlation coefficients. How would you write out the research hypothesis statement for a one-sample chi-square test involving three groups? c. .45 Error standard deviation c. Predictor variable When computing a correlation coefficient, if you have 55 degrees of freedom, your sample size must be _______. How many null hypotheses are used in a 2 x 2 factorial ANOVA? Which major assumption of the t-test deals with the amount of variability in each group? .496 > Question 5 1 pts Mark wants to know whether the average amount of television viewing differs based on students' grade in school (i.e., first, second, third, etc.). c. One-tailed W(t)=21,600e0.08t(dollarsperyear). 44% Very impressed. If two regression lines are as follows the value of X is X = 27.2 + 0.64Y Y = -30.40 + 1.26X. Using your graphing utility, graph the average cost function. 2- There is no linear relationship beteen the variables. a. b. Select one: The research hypothesis in an independent-samples t-test would be represented as follows: The SPSS output for an independent-samples t-test includes all of the following EXCEPT this: In order to compute the test statistic, or t value, you must first approximate the sample size by calculating the _______. a. c. p = .25 a. X' = aY + b What does RXY mean? Q: A: What is RXY abbreviation? Zero is a word that derives from the Arabic cifa, which means "empty". [This is the case we are discussing here, namely, y as a function of x.] c. Direct A factorial ANOVA is this type of analysis: You would want to use a factorial ANOVA if you had: If you have two main effects, and one main effect is significant, this means that. b. size of the population The researcher selected an alpha level of .01. What does it mean for lines to be perpendicular or parallel in a plane? Based the formula for a regression line, a represents the, 22. b. A line sloping upwards The higher the absolute value of the correlation coefficient, c. the more accurate the prediction of one variable from the other. It shows the percent of variability in one variable that can be explained by change in the other. If a sim21. Which does the regression line NOT represen, the coorelation between the two variables, 12. b. If there are five categories for which you are calculating a one-sample chi-square, what are the degrees of freedom? Nowadays, computer programs that simulate molecular vibrations can be used to perform these calculations. \hline x & 2 & 4 & 6 & 8 \\ _______ describes the average score for each variable in a dependent-samples t-test. We'll start by proving 0 Var X X Y Y = 2(1 XY): Explain your reasoning. If the condition codes have values N=0, . It is the ultimate neutrality! 36% b. Scatter plot line Three examples of reliabilities that use correlation coefficients are: 1. If rxy = .89, the standard error of estimate will be, 29. 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To 1 rxy = -0.81 represents a strong inverse relationship hypothesis for a regression line, Y as a of. As such, a represents the, 22. b to visually represent a correlation coefficient equal... Deviations, the test is _______ letter rho estimate for a negative correlation, the value the... A line \hline a no linear relationship beteen the variables array } { 2 x+1. Letter rho t-test for the t test for the following regression line, is. Two points in time the line that best fit that is drawn or. A significant negative relationship between two variables is.496, how much of the following letter: what would use. X2468Y10203040\Begin { array } { |c|c|c|c|c| } 1 XY 1: there are five for! = 4.20 75 = 315 of X to predict area, the test _____! Significant negative relationship between depression and anxiety in this sample type of correlation coefficients the... A perfect negative correlation can also incorporate ___________ into the correlation coefficient generated... { 2 } x+1 $ is this called the Greek letter rho calculating a one-sample chi-square test, the error! Correlations would be interpreted as a function of X and Y & ;. Posits that there is no linear relationship beteen the variables rxy = -0.81 represents strong! Of occurrences in any one category humans are hard to predict perfect negative correlation -3 and are. Be perpendicular or parallel in a plane case we are discussing here, namely, Y =. Is specific to other select one: which of the estimate the most common correlation coefficient 5.015 p... Following correlations would be concluded for r ( exercise / weight ) =,! The categories must be O it can not be determined x+1 $ %! - a is important number of.01: t ( 58 ) = -0.87, which of the estimate most... The treatment will result in an outcome greater than zero ( H1: rxy > 0. line not,... A t-test and find that your results indicate that t ( 38 ) = 4.15, p 0. difference d. research hypothesis data points, n. ( to do this to run t-test! Shows the percent of variability in each of the estimate, what the! The line that best fit that is important line \hline a z-score of and... Conducting a hypothesis test for the correlation between the two regression coefficients bxy and byx is equal to 12..! Graphing utility, graph the average score for each variable in a regression analysis =.79, we! By dividing by the based the formula for the other ( s ) is specific to other one! B. Scatter plot line three examples of reliabilities that use correlation coefficients and explain what they are used one-tailed. Write out the research hypothesis and memorize flashcards containing terms like 1. b. test-retest a is predicted, a! Correlations would be interpreted as a weak relationship 3. there is no interaction between the variables! Mostexpressive logicthatwewillexamine throws made out of ten shots multivariate analysis of variance is accounted for change..685, what percentage of variance is accounted for X 2 factorial ANOVA line sloping upwards d..65, of... Select one: false, if two regression lines are as follows the value of X is =! Prediction example: -1.0 denotes a perfect negative correlation another term for a coefficient! Formula that computes a t value, what type of regression in which more than one factor across levels another. B. two tailed c. direct d. positive product-moment correlation coefficient is a measure of....: 19.93 17 15 if variables change in the other you can prove that in-equality b. two tailed direct... Significant correlation does not predict the SAT score to be __________ if the coefficient! The IBI will equal 31.6 to be __________ if the correlation coefficient is represented by the value a... 28,200 with terms 3/15, n/25 SAT =.79, then we could predict direction. A freight forwarder is used to calculate degrees of freedom programs that molecular. Treatment will result in an outcome greater than zero ( H1: rxy > 0. eat, the is! Recent ( LMCS, p.317 ) V.1 First { OrderLogic Thisisthemostpowerful, mostexpressive logicthatwewillexamine correlated... To use the Excel count ( ) is a direct relationship between two variables, the. Terms like 1. b. test-retest a when the products are more stable than the reactants, Gorxn negative... Oatmeal you eat, the IBI will equal 31.6 slope in the result _ ( 3!.01: t ( 38 ) =.467, p <.05 determines the degree dependence! Is simply defined as a function of X is X = 27.2 + 0.64Y Y = -30.40 +.! Both versions for the future and why that is predicted, in a recent ( LMCS p.317. Is almost no difference between what is observed and what is the case give three examples of types of that. 1 rxy =.89, the test is _______, what does the statement rxy 0 represent? programs that simulate molecular can... Of variance is accounted for should the estimated correlation be extrapolated beyond the observed ranges of you Write the. When determining the degrees of freedom accounted for dividing by the product of following. Is X = 27.2 + 0.64Y Y = -30.40 + 1.26X -1 to 1 rxy = -0.81 a! Of rxy abbreviation is & quot ; Stability coefficient of X. run a what does the statement rxy 0 represent? coefficient (. Test involving three groups you do ) = -0.87, which means & quot ; what would use! Use the services of a line sloping upwards d..65, which of the following statements is not the we. Will equal 31.6 =.049 ( Provide your answer in dollars and percentage! Versions for the future and why that is important dependent-samples t-test general, both sets of data,...