Question

In a study of the effectiveness of an antipsychotic drug, patients treated with the drug were compared to patients receiving a placebo. In terms of the number relapsing, 698 of 1,068 patients relapsed after taking the placebo while 639 out of 2,127 patients relapsed after taking the antipsychotic drug. Test the prediction that the antipsychotic is significantly more effective in preventing relapse than the placebo.

Pelase use SPSS , copy and paste SPSS's results.

	Relapse	No Relapse
Drug	639	429
Placebo	698	1429

Answer 1

Null hypothesis Ho : Antipsychotic is not significantly more effective in preventing relapse than the placebo.

Alternative hypothesis H1 : Antipsychotic is significantly more effective in preventing relapse than the placebo.

SPSS outputs are as follows :

We can observe that P-value = 0 < 0.05 ( level of significance ) , hence, we reject Null hypothesis Ho and conclude that Antipsychotic is significantly more effective in preventing relapse than the placebo.