Dr. Snooze looked at the effect of sleep deprivation on cognitive functioning in

Question

Dr. Snooze looked at the effect of sleep deprivation on cognitive functioning in elderly men and women. He contacted local doctors specializing in geriatrics to obtain a sample for the study. On Monday morning at 8am after 8 hours of sleep the night before and then again a week later at 8am after 4 hours of sleep the night before, 35 subjects solved a complicated maze when they arrived at the lab in the morning and the time to complete the maze was recorded for each subject.

1. To decrease power of the study, Dr. Snooze would:

a.       Calculate each subject’s z score

b.       Conduct both a one-tailed test and a two-tailed test and use the more lenient result

c.       Select subjects from a more diverse population

d.       Use a .05 significance level (alpha) instead of .01

e.       Give subjects an easier maze to solve

f.        All of the above are correct

2. If Dr. Snooze modified the design of the study in his future research by _______, then he would _________:

a.       Having subjects report the number of hours slept the night before and measure the completion time; calculate a correlation coefficient

b.       Decreasing N; conduct a Wilcoxon rank-sum test

c.       Counting the number of people who completed the maze at the two times; conduct a Chi-square Test of Independence

d.       Counting the number of males and females who completed the maze; do an Independent-samples t-test

e.       Asking subjects to also complete the maze a third time after 12 hours of sleep; do a One-way ANOVA

f.        Dividing subjects into three groups; conduct a Factorial ANOVA

Explanation / Answer

1. In order to decrease power of the study Dr. Snooze would use a sig. level of 0.05 instead of 0.01 as he will be only 95% sure that results seen will hold true for the whole population as against 99% in the second case

2. Dr. Snooze modified the design of the study by dividing subjects into 3 groups and then he would conduct a factorial ANOVA as this will give more insights on other factors being involved other than sleep time

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