We have given the value obtained for the test statistic, z, in a one-mean z-test. We have
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We have given the value obtained for the test statistic, z, in a one-mean z-test. We have also specified whether the test is two-tailed, left-tailed, or right-tailed. Determine the P-value in each case and decide whether, at the 5% significance level, the data provide sufficient evidence to reject the null hypothesis in favor of the alternative hypothesis.
Two-tailed test:
a. z = 3.08
b. z = −2.42
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