Suppose,in testing a hypothesis about a mean,the Z test statistic is computed to be 2.04.The null hypothesis should be rejected if the chosen level of significance is 0.01 and a two-tail test is used.

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With a two-tail test at a significance level of 0.01, the critical Z values would be approximately ±2.58. Since 2.04 does not exceed 2.58, the null hypothesis should not be rejected based on this level of significance.

Suppose,in Testing a Hypothesis About a Mean,the Z Test Statistic