According the a University Center for Logistics Management, 7% of all merchandise sold in the United States gets returned. A Seattle department store samples 89 items sold in January and found that 10 of the items were returned. H0: p = 0.07 H1: p < 0.07 Calculate the test statistic: Group of answer choices 1.31 2.33 0.99 1.15 1.57

The test statistic is 1.57.

Step-by-step explanation:

Our test statistic is:

In which X is the sample mean, is the value tested at the null hypothesis, is the standard deviation and n is the size of the sample.

A Seattle department store samples 89 items sold in January and found that 10 of the items were returned.

This means that

7% of all merchandise sold in the United States gets returned.

This means that

For a proportion, the standard deviation is

Test statistic:

The test statistic is 1.57.

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