题目
题目

FA25_QTM_100_3 Midterm Exam 2 - Requires Respondus LockDown Browser

单项选择题

A researcher randomly sampled two groups of mothers based on whether or not they took prenatal vitamins during their pregnancy, then the researcher calculated the proportion of infants born with low birthweight from each group. A hypothesis test where 𝐻 0 : 𝑝 1 − 𝑝 2 = 0 ; 𝐻 𝑎 : 𝑝 1 − 𝑝 2 > 0 finds a p-value of 0.0475. What is the test statistic of this hypothesis test?

选项
A.-1.31
B.1.67
C.1.31
D.-1.67
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标准答案
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思路分析
To tackle this problem, we first restate the setup and what the test statistic represents. The researcher is testing H0: p1 − p2 = 0 against Ha: p1 − p2 > 0, based on a one-sided test for the difference in proportions. The reported p-value of 0.0475 corresponds to the probability in the tail of the test statistic......Login to view full explanation

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