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

Question

A two-tailed hypothesis test is being used to evaluate a treatment effect with α = .05.If the sample data produce a z-score of z = 2.24,then what is the correct decision?​
A)​Reject the null hypothesis and conclude that the treatment has no effect.
B)​Reject the null hypothesis and conclude that the treatment has an effect.
C)​Fail to reject the null hypothesis and conclude that the treatment has no effect.
D)​Fail to reject the null hypothesis and conclude that the treatment has an effect.

Quizplus · Accepted Answer

The correct decision is to reject the null hypothesis and conclude that the treatment has an effect since the z-score of 2.24 exceeds the critical value of ±1.96 at α = .05 for a two-tailed test.

A Two-Tailed Hypothesis Test Is Being Used to Evaluate a Treatment