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Question

For the United States, the mean monthly Internet bill is $32.79 per household (CNBC, January 18, 2006). A sample of 50 households in a southern state showed a sample mean of$30.63. Use a population standard deviation of $\sigma$= $5.60.

What is the value of the test statistic?

Solution

VerifiedAnswered 1 year ago

Answered 1 year ago

Step 1

1 of 6Given:

- $\overline{x}$ = Sample mean = 30.65
- $\sigma$ = Population standard deviation = 5.60
- $n$ = Sample size = 50
- $\alpha$ = Significance level = 0.01

In this exercise, we determine the value of the test statistic belonging to a hypothesis test about the population mean $\mu$ when the population standard deviation $\sigma$ is known.

*What formula do we use to derive the test statistic?*

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