A doctor claims that soft tissue therapy can help reduce the length of time ...

     Help with Hypothesis   Test for Two Samples A doctor claims that soft tissue therapy can help reduce   the length of time patients suffer from backaches. The data below shows the   number of hours per day 11 patients suffered immediately before starting and   after 7 weeks of soft tissue therapy. At a 0.01 significance level, is there   enough evidence to conclude that soft tissue therapy helps to reduce the   length of time patients suffer from backaches? Patient 1 2 3 4 5 6 7 8 9 10   11 Before 2.8 4.2 4.2 1.8 3.1 3.4 4.5 3.5 1.9 2.2 2.1 After 1.4 3.8 3.3 1.1   1.6 2.3 2.9 1.9 1.5 1.1 1.4 Ho: mu1 - mu2 <=0 Ha: mu1 - mu2 > 0 (claim)   My answer: Fail to Reject the Ho. There IS sufficient evidence to conclude   that soft tissue therapy reduces the duration of backache.