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 = -0.43, then what is the correct decision?   a. Reject the null hypothesis and conclude that the treatment has an effect.   b.  Reject the null hypothesis and conclude that the treatment has no 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.

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