Test for evidence of efficacy using a t test

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Reference no: EM131024855

A pain-killing drug was tested for efficacy in 50 women who were experiencing uterine cramping pain following childbirth. Twenty-five of the women were randomly allocated to receive the drug, and the remaining remaining 25 received a placebo (inert substance). Capsules of drug or placebo were given before breakfast and again at noon. A pain relief score, based on hourly questioning throughout the day, was computed for each woman. The possible pain relief scores ranged from 0 (no relief) to 56 (complete relief for 8 hours). Summary results are shown in the table.

		PAIN RELIFE SCORE
TREATMENT	n	MEAN	SD
Drug	25	31.96	12.05
Placebo	25	25.32	13.78

(a) Test for evidence of efficacy using a t test. Use a directional alternative and α = 0.05.

(b) If the alternative hypothesis were nondirectional, how would the answer to part (a) change?

Reference no: EM131024855

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