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A hypothesis test is being used to evaluate a treatment effect with a = .05. If...

A hypothesis test is being used to evaluate a treatment effect with a = .05. If the sample data produce a z-score of z = -2.24, then what is the correct decision? a. Fail to reject the null hypothesis and conclude that the treatment has an effect. b. Fail to reject the null hypothesis and conclude that the treatment has no effect. c. Reject the null hypothesis and conclude that the treatment has no effect. d. Reject the null hypothesis and conclude that the treatment has an effect.   

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Answer #1

since z score = -2.24 and

p-value = 0.025

by p-value method

p-value is less than the level of significane (that means 0.05>0.025)

so we reject the null hypothesis

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Reject the null hypothesis and conclude that the treatment has an effect.   

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