Question

Chapter 14 Problem F: A random sample of 15 automobile mechanics certified to work on a certain type of car was selected, and the time in minutes) necessary for each one to diagnose a particular problem was determined, resulting in the following data: 30.6 30.1 15.6 26.7 27.1 25.4 35.0 30.8 31.9 53.2 12.5 23.2 8.8 24.9 30.2 Use the Wilcoxon signed-rank test at significance level a = .10 (approximately) to decide whether the data suggests that true average diagnostic time is less than 30 minutes. Let denote the true average diagnostic time. Then the appropriate hypotheses are: Hou = 30 versus H: 4 < 30. 15. Refer to Problem F. What is the rejection region for this test? (1) 8+ < 45 (3) 8+ > 84 (2) 8+ <37 (4) 8+ > 83

I am confused with option 2 and 4, what is the answer?

Answer 1

Ho: M = ell = 30 ( claim) left fail. M < 30 Ha' ? the rejecti So, on region St < t St = 37 option (2) m CS Scanned with CamScanner