There is some evidence that REM sleep, associated with dreaming, may also play a

Question

There is some evidence that REM sleep, associated with dreaming, may also play arole in leaming and memory processing. For example, Carlyle Smith and Lorelei Lapp found increased REM activity for college students during exam periods. Smith, C., & Lapp, L (1991). Increases in number of REMs and REM density in humans following an intensive leaming period. Sleep: Journal of Sleep Research & Sleep Medicine, 14, 325-330.] Suppose that REM activity for asample of n 16 students during the final exam period produced an average score of M 143. Regular REM activity for the college population averages H 110 with a standard deviation of a 50. The population distribution is approximately normal. Do the data from this sample provide evidence for a significant increase in REM activity during exams? use a one-tailed test with a .01. Standard Normal Distribution Mean 0.0 Standard Deviation O O O The null hypothesis is Ho: Condusi O Failto reject the null hypothesis; there is no significant increase. O Failto reject the null hypothesis; there is a significant increase. O Reject the null hypothesis; there is a significant increase. O Reject the null hypothesis; there is no signifi increase. cant Compute Cohen's d to estimate the size of the effect.

Explanation / Answer

Answers to the question parts as below:

Sample mean =143
Pop. Mean = 110
Stdev = 50
n=16

Alpha = .01

1.
Ho: Mu <=110
Ha: Mu>110

2.
Z-critical =2.32
z =(143-110)/(50/sqrt(16)) = 2.64

3. Since this Z statitic is more than Z critical we reject Null hypothesis
Option 3 is right

4. COhen' d score estmate of size
d = 143-110 / 50 = .66

5. The result reject the null hypothesis. Meaning, there is increase in REM
activity for college students during exam periods.

A Cohen' d above .50 means a large effect size

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