Referring to the same data/computations above (repeated here): Standard Deviation Groups Grp-1 (8 or more hours) Grp-2 (6 or fewer hours) Mean 20.5 16 4.30 16.2 16 4.50 t-value df p-value Mean Standard Error of CI.95 CI95 Difference Mean Difference Lower Upper 7.478 0.010 1.122 36. Based on the evidence, she should:
Referring to the same data/computations above (repeated here): Standard Deviation Groups Grp-1 (8 or more hours) Grp-2 (6 or fewer hours) Mean 20.5 16 4.30 16.2 16 4.50 t-value df p-value Mean Standard Error of CI.95 CI95 Difference Mean Difference Lower Upper 7.478 0.010 1.122 36. Based on the evidence, she should:
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
Transcribed Image Text:37. Given the data and your computations above, compute a meaningful estimate of the effect size and interpret the findings of the study in terms of the
effect size.
O Cohen's d= 0.98; The mean word recall for subjects reporting 8 hours of sleep or more per night was approximately 0.98 standard deviations greater than the mean recall for subjects
reporting 6 or fewer hours of sleep per night.
O Cohen's d= 0.98; Subjects reporting 8 hours of sleep or more per night recalled 0.98 standard deviations more words than subjects reporting 6 or fewer hours of sleep per night.
O Cohen's d = 0.55; On average, subjects reporting 8 hours of sleep per night recalled 4.3 more words than subjects reporting 6 or fewer hours of sleep per night.
O Cohen's d = 0.98; On average, subjects reporting 8 hours of sleep per night recalled 4.3 more words than subjects reporting 6 or fewer hours of sleep per night.
O Cohen's d= 0.55; The mean word recall for subjects reporting 8 hours of sleep or more per night was approximately 0.55 standard deviations greater than the mean recall for subjects
reporting 6 or fewer hours of sleep per night.
O Cohen's d = 0.55; Subjects reporting 8 hours of sleep or more per night recalled 0.55 standard deviations more words than subjects reporting 6 or fewer hours of sleep per night.

Transcribed Image Text:Referring to the same data/computations above (repeated here):
Groups
Grp-1 (8 or more hours)
Grp-2 (6 or fewer hours)
Mean
Standard Deviation
20.5
16
4.30
16.2
16
4.50
t-value
df
p-value
Mean
Standard Error of
CI95
CI95
Difference
Mean Difference
Lower
Upper
7.478
0.010
1.122
36. Based on the evidence, she should:
O fail to reject the null hypothesis
O reject the null hypothesis
O confirm that her research hypothesis is true
O accept the null hypothesis
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