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A car company claims that their Super Spiffy Sedan averages 31 mpg. You randomly select 8...

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Statistics

A car company claims that their Super Spiffy Sedanaverages 31 mpg. You randomly select 8 Super Spiffies from localcar dealerships and test their gas mileage under similarconditions.

You get the following MPG scores:

MPG:30,28,32,26,33,25,28,30

We wan to test whether the actual gas mileage for these carsdeviate significantly from 31 (alpha = .05).

1- Are we given the value of the populationmean (μ)?

2- What is the the standard error?

3- What is the the null hypothesis?

4- What is the the value of the teststatistic?

5- Based on the p-value you obtained, should wereject the null hypothesis at significance level α = 0.05?

6- What is a 95% confidence interval for themean actual gas mileage of the company's cars?

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