题目
题目

OSC 2030-009 Fall 2025 SUBMIT: Graded Homework Module 8 (Chap 9)

单项选择题

For the following hypothesis test: With n = 80, σ = 9, and = 47.1, state the calculated value of the test statistic z.

选项
A.3.151
B.-3.121
C.-2.141
D.2.087
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思路分析
To start, we identify the key values provided: n = 80, σ = 9, and x̄ = 47.1, with the null hypothesis μ ≤ 45 and alternative μ > 45. The test statistic for a z-test with known population standard deviation is computed as z = (x̄ − μ0) / (σ / √n). Option by option analysis: Option A: 3.151 If z were 3.151, that would imply......Login to view full explanation

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