10) Ultrasound is often used to treat soft tissue injuries of the knee. The range of motion of 7 randomly selected subjects was measured both before and after the ultrasound treatment was applied....

A and B please

Extracted text: 10) Ultrasound is often used to treat soft tissue injuries of the knee. The range of motion of 7 randomly selected subjects was measured both before and after the ultrasound treatment was applied. Subject 1 3 4 5 6. 7 Pre- 31 53 45 57 50 43 32 treatment Post- 32 59 46 64 49 45 40 treatment Find the difference between the pre-treatment and post-treatment for each subject. [For example, for subject 1, the difference is 31 – 32 = -1] a) Find the sample mean and standard deviation of the difference, called µa . b) Use the matched pair design to determine whether the mean difference, µa, is less than zero. Use a = .05. [Note: if µa < 0,="" then="" this="" would="" imply="" that="" the="" pre-treatment="" measurement="" is="" less="" than="" the="" post-treatment="">