Part 1) A physical therapists wishes to determine whether an exercise program in
ID: 2959999 • Letter: P
Question
Part 1)A physical therapists wishes to determine whether an exercise program increases flexibility. He measures the flexibility (in inches) of 12 randomly selected subjects both before and after an intensive eight-week training program and obtains the following data:
Before: 18.5, 21.5, 16.5, 21, 20, 15, 19.75, 15.75, 18, 22, 15, 20.5
After: 19.25, 21.75, 16.5, 20.5, 22.25, 16, 19.5, 17, 19.25, 19.5, 16.5, 20
Test the claim that the flexibility before the exercise program is less than the flexibility after the exercise program at a significance level of 0.01. Note: the data is approximately normal with no outliers.
Part 2)
Using the data from the previous problem, construct a 95% confidence interval about the population mean difference. Interpret your result.
Any help would be greatly appreciated. Thank you for your time.
Explanation / Answer
(a) why is this a matched - pairs? Since the subjects are tested both before and after an intensive eight-week training program, it uses matched t-pairs test.