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A researcher conducts an independent - measures study examining the effectiveness of a group exercise program at an assisted living facility for elderly adults. One group of residents is selected to participate in the program, and a second group serves as a control. After 6 weeks, the researcher records a combined score measuring balance and strength for each individual. The data are as follows :
Control Exercise
n = 10 n = 15
M =12 M =15.5
SS = 120.5 SS = 190.0
a. Does the exercise program have a significant effect ? Use an alpha level of .05, two tails.
b. Compute Cohen's d to measure the size of the treatment effect.
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