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# PS390 Statistical Reasoning in Psychology Exam 5 Part 2 Answers (Ashworth College)

## B. medium effect. • C.

B. medium effect. • C. large effect. • D. None of the above, as there are no standards for interpreting R². Question 24 of 40 2.5/ 2.5 Points An analysis of variance differs from a t test for independent means in that an analysis of variance: • A. is usually used to compare two groups, while a t test for independent means can be used to compare two or more groups. • B. can be used to compare three or more groups, while a t test for independent means cannot be used to compare more than two groups. • C. is conducted before the experiment, while a t test for independent means is conducted after the experiment. • D. includes computation of group variances as part of the analysis, while a t test does not include these computations. Question 25 of 40 0.0/ 2.5 Points When carrying out an analysis of variance with equal sample sizes, the estimated variance of the distribution of means is converted to an estimated variance of the population of individual scores by: • A. multiplying the estimated variance of the distribution of means by the number of scores in each sample. • B. dividing the estimated variance between groups by the number of groups. • C. dividing the estimated variance of the distribution of means by the number of scores in each sample. • D. multiplying the estimated variance of the population of individual scores by the number of groups. Question 26 of 40 2.5/ 2.5 Points In an analysis of variance with a within-groups variance estimate of 8.5 and a between-groups variance estimate of 5.3, what is the F ratio? • A. 5.3 / 8.5 = 0.62 • B. 8.5 / 5.3 = 1.60 • C. √5.3 / 8.5 = 0.27 • D. √8.5 / 5.3 = 0.55 Question 27 of 40 2.5/ 2.5 Points If a research article does NOT report the variance estimates, R²: • A. can be figured by [(F)(dfBetween.]/[(F)(dfBetween) + dfWithin]. •

B. can be figured by F/dfWithin. • C. can be estimated by SM/SWithin. • D. cannot be figured. Question 28 of 40 2.5/ 2.5 Points In an analysis of variance, if the null hypothesis is true, then: • A. the research hypothesis can also be true. • B. fewer participants can be included in the experiment. • C. there is less variance among means of samples than if the null hypothesis were not true. • D. the within-groups estimate of the population variance is smaller than the between-groups estimate. Question 29 of 40 2.5/ 2.5 Points The cutoff F used to evaluate the significance of the Scheffé test for any particular comparison between two group means is • A. the same cutoff F used for the overall study. • B. the cutoff based on df = 1 for the numerator and the overall dfBetween for the denominator. • C. the cutoff based on df = 2 for the numerator and the overall dfWithin for the denominator. • D. the cutoff based on df = 1 for the numerator and df = overall dfWithin / 2 for the denominator. Question 30 of 40 2.5/ 2.5 Points When sample sizes are equal, MSWithin is figured by: • A. summing the population variance estimates figured within each group and dividing by the total number of participants (over all groups). • B. summing the population variance estimates figured within each group and dividing this sum by the number of groups. • C. multiplying the within-groups sum of squares (SSWithin) by the size of each sample (n). • D. dividing the within-groups sum of squares (SSWithin) by the size of each sample (n). Question 31 of 40 2.5/ 2.5 Points If a research article presented the results of an analysis of variance as, "F (2, 38) = 3.60, p < .05," then how many groups were there in the study? •

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