3. How do I compute the p-value and make a decision?
Compute the test statistic using the sample mean, hypothesized mean 65, and standard error. For a two-tailed test, double the one-sided tail probability to get the p-value. Reject Ho if p < α, or alternatively compare the statistic to critical values ±zα/2 or ±tα/2 with correct degrees of freedom.
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