Question: What hypothesis testing procedure should you use to answer these questions? Assume all samples are simple random samples, and assume = 0.05 if it isn't

What hypothesis testing procedure should you use to answer these questions? Assume all samples are simple random samples, and assume = 0.05 if it isn't specified.

A car company says that the mean gas mileage for its luxury sedan is at least 21 mpg. You believe the claim is incorrect and find that a random sample of 5 cars has a mean gas mileage of 19 mpg and a sample standard deviation of 4 mpg. Assume the gas mileage of all of the company's luxury sedans is normally distributed. At = 0.05, test the company's claim.

Question 20 options:

One sample z-test for the population mean.

Two sample z-test for the population means.

One sample z-test for proportions.

Two sample z-test for proportions.

One sample t-test for the population mean.

None of our hypothesis tests fit.

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