Imagine that you hypothesize that students will complete a test more quickly if they take the test in cold room than in a warm room. If the critical z of a test is -2.33 and you obtain a z-statistic of 1.2, you should reject the null hypothesis.

Question

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The critical z value of -2.33 tells us that we are working with a two-tailed test at the 1% significance level. A z-statistic of 1.2 is greater than -2.33, but it is not significant enough to reject the null hypothesis. Therefore, we cannot conclude that students will complete a test more quickly in a cold room than in a warm room based on this information.

Imagine That You Hypothesize That Students Will Complete a Test