The distribution for the test is:

A new AIDS prevention drug was tried on a group of 224 HIV positive patients. Forty-five patients developed AIDS after four years. In a control group of 224 HIV positive patients, 68 developed AIDS after four years. We want to test whether the method of treatment reduces the proportion of patients that develop AIDS after four years or if the proportions of the treated group and the untreated group stay the same.
Let the subscript t = treated patient and u_t = untreated patient.

An experiment is conducted to show that blood pressure can be consciously reduced in people trained in a “biofeedback exercise program.” Six subjects were randomly selected and blood pressure measurements were recorded before and after the training. The difference between blood pressures was calculated (after - before) producing the following results: X̅ _d = −10.2 s_d = 8.4. Using the data, test the hypothesis that the blood pressure has decreased after the training.

Transcribed Image Text:

a. t5 b. 16 C. N(-10.2, 8.4) d. N(-10.2, 8.4 .) 6