One-way ANOVA Problems - Laboratory | PSYC 610, Lab Reports of Psychology

Download One-way ANOVA Problems - Laboratory | PSYC 610 and more Lab Reports Psychology in PDF only on Docsity! PSYC 610 – One-way ANOVA problems 1. An investigator is interested in the effects of stress on reaction time. She gives a reaction time test to three groups of subjects: one group that is under a great deal of stress, one group under a moderate amount of stress, and a third group that is under almost no stress. Theory A suggests that subjects under a moderate amount of stress will perform better than subjects in either the very low or the very high stress groups. Theory B predicts that subjects in the high stress group will perform better than subjects in either the low stress or the moderate stress groups. Theory C predicts that subjects in the moderate stress condition will perform significantly more poorly than subjects in the low stress condition. a. Using an alpha level of .05, please use SPSS to perform the overall ANOVA and then determine whether the data below provide evidence for Theory A, Theory B, or Theory C. b. Please write a paragraph that summarizes the conclusions that the investigator is entitled to draw from these results. In this paragraph, be sure to make it clear how you handled the issue of conducting three planned comparisons. Also provide the ANOVA table for these results. c. Are the comparisons indicated above orthogonal? a1 a2 a3 High Stress Moderate Stress Low Stress ----------------------------------------------------------------- 6 8 10 7 10 11 4 11 8 5 7 6 6 12 13 3 11 12 ----------------------------------------------------------------- 2. An investigator is interested in the effects of noise on the ability of subjects to concentrate. She assigns subjects randomly to one of three Noise conditions: low noise, moderate noise, and loud noise. She administers a test of concentration while the noise is present. She predicts that there will be an overall effect of noise on the ability to concentrate. Theory A suggests that people in the low noise condition will have higher scores on concentration than subjects in the moderate noise condition, but that no difference in concentration will be observed between subjects in the moderate and loud noise groups. Theory B suggests that subjects in the moderate noise condition will have higher concentration scores than subjects in loud noise condition, but that no difference in concentration will be observed between subjects in the low noise and moderate noise conditions. a. Please use SPSS to test the investigator’s prediction of an overall effect of noise on the ability to concentrate and the comparisons that she should conduct to determine whether Theory A or Theory B is better supported by the data. b. Please write a paragraph that presents the conclusions that the investigator is entitled to draw from the results of these tests. Also provide the ANOVA table for these results. Low Noise Moderate Noise Loud Noise ------------------------------------------------------ 10 5 6 11 4 3 13 4 3 12 5 5 --------------------------------------------------- 3. An investigator is interested in the effects of sleep deprivation on memory function. He randomly assigns each of 20 participants to one of four groups. Five subjects take a test of memory function after they have been awake for eight hours (No sleep deprivation). Five subjects take the test after they have been awake for 18 hours (mild sleep deprivation). Five subjects take the test after they have been awake four 24 hours (moderate sleep deprivation). Five subjects take the test after they have been awake for 48 hours (severe sleep deprivation). Higher scores on the test of memory function indicate higher levels of performance. The investigator predicts that an overall effect of sleep deprivation on memory function will be observed. He predicts that people with at least some sleep deprivation will perform significantly more poorly than people who have not been sleep deprived. He also predicts that people who have been deprived of sleep for 24 hours will perform significantly more poorly than people who have been deprived of sleep for 18 hours. He also predicts that people who have been deprived of sleep for 48 hours will perform significantly more poorly than people who have been deprived of sleep for 24 hours. Please use SPSS to test each of the predictions of the investigator. Please describe the results of these tests in a paragraph written in APA-style for a results section. Please report all tests as F- tests. Please hand in your paragraph describing the results, the ANOVA table containing the results for each F-test, a printout of the spreadsheet containing your data, and a printout of your output window. No 18 hours 24 hours 48 hours deprivation deprivation deprivation deprivation a1 a2 a3 a4 ---------------------------------------------------------- 23 16 8 15 19 14 7 12 17 12 9 14 20 11 10 13 25 14 6 13 --------------------------------------------------------