How do I get the critical value? A car company says that the mean gas mileage fo

Question

How do I get the critical value?

A car company says that the mean gas mileage for its luxury sedan is at least 25 miles per gallon (mpg). You believe the claim is incorrect and find that a random sample of 7 cars has a mean gas mileage of 24 mpg and a standard deviation of 4 mpg. At = 0.025, test the company's claim. Assume the population is normally distributed. lick here to view page 1 of the normal table. Which sampling distribution should be used and why? 0 A. Use a normal sampling distribution because the population is normal, and is known. ° C. Use a t-sampling distribution because the population is normal, and is known. 0 E. Use a t-sampling distribution because n

Explanation / Answer

Critical value = -t0.025,6 = -2.447 (ans)

                                                                                                                  

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