A researcher conducts a "between-subjects" study examining the effectiveness of a group exercise program at an assisted living facility for elderly adults. One group of residents is selected to...

A researcher conducts a "between-subjects" 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 the second group of participants serves as a control group.

After 6 weeks, the researcher reports a combined score measuring balance & strength for each individual. The data is below:

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 a two-tailed test with an alpha level of .05

b.) Compute Cohen's d to measure the size of the treatment effect