A car company says that the mean gas mileage for its luxury sedan is at least 23 miles per gallon (mpg). You believe the claim

Question

A car company says that the mean gas mileage for its luxury sedan is at least 23 miles per gallon (mpg). You believe the claim is incorrect and find that a random sample of 6 cars has a mean gas mileage of 20 mpg and a standard deviation of 3 mpg. At a= 0.05, test the company's claim. Assume the population is normally distributed.
Which sampling distribution should be used and why?
A. Use a normal sampling distribution because n > 30.
B. Use a normal sampling distribution because the population is normal, and a is unknown.
C. Use a normal sampling distribution because the population is normal, and o is known.
D. Use a t-sampling distribution because the population is normal, and a is unknown.
E. Use a t-sampling distribution because the population is normal, and o is known.
F. Use a t-sampling distribution because n< 30.

State the appropriate hypotheses to test.

Kunduz · Accepted Answer

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