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Chapter 8: Q. 9.73 (page 380)

We have been provided a scenario for a hypothesis test for a population mean. Decide whether the z-test is an appropriate method for conducting the hypothesis test. Assume that the population standard deviation is known in the given case.

Preliminary data analyses reveal that the sample data contain no outliers but that the distribution of the variable under consideration is probably highly skewed. The sample size is 24.

Short Answer

Expert verified

The use of the z-test is inappropriate.

Step by step solution

01

Step 1. Given information.

Consider the given question,

The sample size is24.

02

Step 2. Consider the given size.

First, we need to make sure that the z-test procedure is suitable for the given sample size. To use the z-test, we need to take care of the following conditions,

In case the sample size is n<15, then the z-test procedure can be used when the variable is very close to being normally distributed or normally distributed.

If the sample size is between 15<n<30, then the z-test procedure can be used when there is no outlier in the data or the variable is far from being normally distributed.

If the sample size is greater than 30<n, then the z-test procedure can be used without any limitation.

Here, the given sample size is small. This means, the sample size nis 24<30.

The distribution of the variable is also highly skewed.

Hence, it can be said that the use of the z-test is inappropriate.

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