Question

Assume that a simple random sample has been selected from a normally distributed population and test the given claim.

Patients with chronic fatigue syndrome were tested, then retested after being treated with fludrocortisone. A standard scale from -7 to +7 is used to measure fatigue before and after the treatment. The changes are summarized with these statistics: n = 16,  = 1.8, s = 3.74. The changes were computed in a way that makes positive values represent improvements.

a) Use a 0.01 significance level to test the claim that mean change is positive.

Claim:   ---Select--- < > ≤ ≥ ≠ = 0

Ho:     ---Select--- < > ≤ ≥ ≠ = 0

H1:     ---Select--- < > ≤ ≥ ≠ = 0

b) What is the rejection result?

Reject the null hypothesis.Do not reject the null hypothesis.    Not enough information.

c) What is the conclusion? Does the treatment appear to be effective?

There is not significant evidence that the mean change is positive. The treatment appears to be effective.There is significant evidence that the mean change is positive. The treatment appears to be effective.    There is not significant evidence that the mean change is positive. The treatment does not appear to be effective.There is significant evidence that the mean