My null hypothesis is : At sick call, the medical officer thinks that if 15 injured musculoskeletal recruits go to physical therapy twice a week instead of 3 times , their recovery period will be longer. The averagerecovery times for the recruits with minor injuries is 7 days, but could be longer. Test the claim that u>=7 days. Use 0.5 as your alpha.

u=7; n=15; xbar=5; o(sigma)= 2.5