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Most sleeping pills reduce the period of dreaming sleep, also known as rapid eye movement (REM) sleep.

 Most sleeping pills reduce the period of dreaming sleep, also known as rapid eye movement (REM) sleep. You want to validate the claims of a new sleeping pill, which is advertised as not affecting REM sleep at all. You randomly select two groups of participants. Group 1 receives a placebo, and group 2 receives the recommended dosage of the new sleeping pill. REM sleep is monitored in a sleep lab during the course of one night's sleep, and the total number of minutes spent in REM are counted for each subject. Table 1 below summarizes the results.



a) What test should you use to analyze these results, and why? Will you use a one-tail or two-tailed test, and why?

b) What significance level will you use, and why?

c) What are the results of your analysis? Did your IV have a significant effect on your DV? Show your work.

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