If we are testing a hypothesis that a sample mean does not differ from a hypothesized value at the 95 percent level of confidence, and we arrive at a z value of 1.99, we would fail to support the hypothesis.

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A z value of 1.99 corresponds to a p-value of approximately 0.05, which is the cutoff for rejecting the null hypothesis at the 95% confidence level. Therefore, we would reject the hypothesis and conclude that the sample mean does differ from the hypothesized value.

If We Are Testing a Hypothesis That a Sample Mean