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Chapter 10: Q 13. (page 446)

Each of Problems 12-17 provides a type of sampling (independent or paired), sample size(s), and a figure showing the results of preliminary dafa analyses on the sample(s). For independen samples, the graphs are for the nwo samples; for a paired sample, the graphs are for the paired differences. The intent is to employ the sample data fo perform a hypothesis test to compare the means of the two populations from which the duta were obtained. In each case, decide which if ary; of the procedures that you have studied should be applied.

1.3. Independent;n1=25,n2=20;Fig.10,12

Short Answer

Expert verified

The nonpooled t-test procedure would be appropriate

Step by step solution

01

Step 1:Given information

02

Step 2:Explaination

Identify which test procedure is preferable.

Assumption for nonpooled t-test is given below:

- The selected sample should be a simple random sample from two populations.

- The samples are independent of one another.

- Population is approximately normal.

- The sample size is large.

From the graphs, it is observed that the nonpooled t-test procedure would be appropriate because the two population standard deviations are not equal. Moreover, the distribution of the data is roughly normal.

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Most popular questions from this chapter

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In this Exercise, we have provided summary statistics for independent simple random samples from two populations. In each case, use the pooled t-lest and the pooledt-interval procedure to conduct the required hypothesis test and obtain the specified confidence interval.
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