21. A psychologist would like to examine the effects of different testing methods on the final performance of college students. One group gets regular quizzes, one group gets three large exams, and the third group only gets a final exam. At the end of the course, the psychologist interviews each student to get a measure of the student’s overall knowledge of the material. (see question 21 attachment) a. State the null hypothesis. b. Compute the necessary hypothesis test using a two-tailed test with = .05. Show your calculations. c. Make a decision about your null hypothesis. (Include the critical value you used to base your decision.) d. Write an APA format statement summarizing your findings. (Include a measure of effect size if necessary.) e. Explain what would need to be done next to follow up on any significant effects. 22. The following data were collected from a repeated-measures study. (see picture 22) a. State the null hypothesis. b. Compute the necessary hypothesis test using a two-tailed test with a = .05. Show your calculations. c. Make a decision about your null hypothesis. (Include the critical value you used to base your decision.) d. Write an APA format statement summarizing your findings. (Include a measure of effect size if necessary.) e. Explain what would need to be done next to follow up on any significant effects. 23. The following data were obtained from a two-factor independent-measures experiment with n = 5 participants in each treatment condition. Factor A is Gender and Factor B is rotation, the DV is accuracy. (see question 23 attachment) a. State the hypotheses for each of the three separate tests included in the two-factor ANOVA. b. Draw a graph that would allow you to evaluate the correct means for each of the three hypothesis tests. c. Predict your decision for each of the three hypothesis tests based on the graphed means. Write a concluding statement for each.