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Elementary Statistics by Mario Triola, 13th edition Chapter 8.1.14 ​ Claim: Fewer than 97​% of adults...

Elementary Statistics by Mario Triola, 13th edition Chapter 8.1.14 ​

Claim: Fewer than 97​% of adults have a cell phone. In a reputable poll of 1056 ​adults, 87​% said that they have a cell phone. Find the value of the test statistic.

The value of the test statistic is? ​(Round to two decimal places as​ needed.)

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Answer #1

Let p be the proportion of adults who have a cell phone.

In a reputable poll of 1056 ​adults, 87​% said that they have a cell phone.

Therefore,

We want to test the claim that fewer than 97​% of adults have a cell phone.

The hypothesis testing problem is:

The test statistic is:

Hence test statistic is:

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