A researcher would like to determine if relaxation training will affect the number of headaches for chronic headache sufferers. For a week prior to training, each participant records the number of headaches suffered. Participants then receive relaxation training and for the week following training the number of headaches is again measured. The data are as follows: Before After 6 4 5 1 3 3 3 1 6 2 2 1 4 3 4 2 A. Compute the mean and variance for the sample of difference scores. MD = _____________________________ SS = ______________________________ s² = _______________________________ B. Do the results indicate a significant difference? Use a two-tailed test with α = .05 SMD = _____________________________ tcritical = __________________________ tcalculated = __________________________ Decision = _________________________ C. Compute Cohen’s d to measure the size of the effect. Cohen’s d = ________________________
A researcher would like to determine if relaxation training will affect the number of headaches for chronic headache sufferers. For a week prior to training, each participant records the number of headaches suffered. Participants then receive relaxation training and for the week following training the number of headaches is again measured. The data are as follows:
Before After
6 4
5 1
3 3
3 1
6 2
2 1
4 3
4 2
A. Compute the mean and variance for the sample of difference scores.
MD = _____________________________
SS = ______________________________
s² = _______________________________
B. Do the results indicate a significant difference? Use a two-tailed test with α = .05
SMD = _____________________________
tcritical = __________________________
tcalculated = __________________________
Decision = _________________________
C. Compute Cohen’s d to measure the size of the effect.
Cohen’s d = ________________________
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