IV. A researcher has 10 participants rate their mood (-100 = extremely negative, +100 extremely positive) before watching a sad movie and after watching a sad movie. Their mood ratings prior to watching the movie and after watching the movie are listed below. Assume that both sets of mood ratings come from normally distributed populations with equal variances. Prior After 22 Participant 1 -10 23 20 43 23 -12 34 4 40 56 19 51 -30 -38 3 20 8. 9. 10 15 10 Does watching the sad movie affect participants' moods (use a = .02, two-tailed)? A. What are the null hypothesis and the alternative hypothesis? B. What are the critical value(s) (make sure to indicate what degrees of freedom were used to determine this)? C. Use SPSS to calculate your test statistic. D. Explain why you would or would not reject the null hypothesis. E. Use SPSS to help you calculate Cohen's d and r (measures of effect size) F. Use SPSS to calculate a 98% CI for the mean difference in mood across time.

IV. A researcher has 10 participants rate their mood (-100 = extremely negative, +100 extremely positive) before watching a sad movie and after watching a sad movie. Their mood ratings prior to watching the movie and after watching the movie are listed below. Assume that both sets of mood ratings come from normally distributed populations with equal variances. Prior After 22 Participant 1 -10 23 20 43 23 -12 34 4 40 56 19 51 -30 -38 3 20 8. 9. 10 15 10 Does watching the sad movie affect participants' moods (use a = .02, two-tailed)? A. What are the null hypothesis and the alternative hypothesis? B. What are the critical value(s) (make sure to indicate what degrees of freedom were used to determine this)? C. Use SPSS to calculate your test statistic. D. Explain why you would or would not reject the null hypothesis. E. Use SPSS to help you calculate Cohen's d and r (measures of effect size) F. Use SPSS to calculate a 98% CI for the mean difference in mood across time.

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MATLAB: An Introduction with Applications

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Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

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Page
of 3
IV. A researcher has 10 participants rate their mood (-100 = extremely negative, +100 extremely
positive) before watching a sad movie and after watching a sad movie. Their mood ratings prior
to watching the movie and after watching the movie are listed below. Assume that both sets of
mood ratings come from normally distributed populations with equal variances.
Participant
1
Prior After
-10
22
43
23
23
3
20
-12
40
34
6.
56
51
19
-30
-38
7
8.
20
3
10
15
10
Does watching the sad movie affect participants' moods (use a = .02, two-tailed)?
A. What are the null hypothesis and the alternative hypothesis?
B. What are the critical value(s) (make sure to indicate what degrees of freedom were
used to determine this)?
C. Use SPSS to calculate your test statistic.
D. Explain why you would or would not reject the null hypothesis.
E. Use SPSS to help you calculate Cohen's d and r2 (measures of effect size)
F. Use SPSS to calculate a 98% CI for the mean difference in mood across time.
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