A researcher would like to determine if meditation training willaffect anxiety-related distress among a group of participants. Fora week prior to training, each participant records the number oftimes they feel anxious. Participants then receive meditationtraining and for the week following training the number of timesthey feel anxious is again measured. The data are as follows:
Before     After
8Â Â Â Â Â Â Â Â Â Â Â Â 5
7Â Â Â Â Â Â Â Â Â Â Â Â 2
5Â Â Â Â Â Â Â Â Â Â Â Â 4
5Â Â Â Â Â Â Â Â Â Â Â Â 2
8Â Â Â Â Â Â Â Â Â Â Â Â 3
4Â Â Â Â Â Â Â Â Â Â Â Â 2
6Â Â Â Â Â Â Â Â Â Â Â Â 4
6Â Â Â Â Â Â Â Â Â Â Â Â 3
a. Compute the mean and sum of the squared deviations for thesample of difference scores.
b. Do the results indicate a significant difference? Use atwo-tailed test with α = .05.
c. Compute Cohen’s d to measure the size of theeffect.
