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9. Hypothesis Testing for One Sample - 2! 2부
9. Hypothesis Testing for One Sample / Critical Values and Rejection Regions / 문제 4
문제 4

A researcher claims that more than 40%40\% of adults prefer drinking coffee over tea. To test this claim, a random sample of 100100 adults is surveyed, and 47%47\% report preferring coffee. Using a significance level of α=0.01\(\alpha\)=0.01, determine the critical value zcritz_{\(\text{crit}\)}, and decide whether to reject or fail to reject the null hypothesis.