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Asked Nov 16, 2019

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Step 1

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Step 2

**a)**

**Computation of test statistic:**

In this context, the claim is that the mean time is 20 or less. Therefore, H_{0}:µ ≥ 20 Vs H_{1}:µ< 20. Here, the sample mean, *x*-bar is 19.4, Population mean, *µ* is 20.Population standard deviation, *σ* = 2. Sample size, *n* is 50. The test statistic for *z*-test is calculated as **2.96 **from the calculations given below.

Step 3

**b.**

The *P*-value for the *z*-test can be obtained using the excel formula,** “**=NORM.S.DIST(-2.12,TRUE)”**. **Thus, the *P...*

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