Which sampling distribution should be used and why? O A. Use a t-sampling distribution because the population is normal, and o is known. O B. Use a t-sampling distribution because the population is...

A car company says that the mean gas mileage for its luxury sedan is at least 21 miles per gallon. you believe the claim is incorrect and find that the random sample of 7 cars has a mean gas mileage as of 18 mpg and a standard deviation of 2 mpg. at a=0.05, test the companys claim. assume the population is normally distributed. use t-distribution table.

Extracted text: Which sampling distribution should be used and why? O A. Use a t-sampling distribution because the population is normal, and o is known. O B. Use a t-sampling distribution because the population is normal, and o is unknown. O C. Use a normal sampling distribution because the population is normal, and o is unknown. O D. Use a normal sampling distribution because the population is normal, and o is known. O E. Use a t-sampling distribution becausen<30. o="" f.="" use="" a="" normal="" sampling="" distribution="" because="" n=""> 30. State the appropriate hypotheses to test. Ο Α. Η0 μ21 Ha p> 21 Ο Β. H μ-21 Ha µ±21 O C. Ho µ 21 H p= 21 D. Ho u 21 Ha p<>


Extracted text: What is the value of the standardized test statistic? The standardized test statistic is (Round to two decimal places as needed.) What is the critical value? The critical value is (Round to three decimal places as needed.) What is the outcome and the conclusion of this test? evidence to the car company's claim that the mean Ho At the 5% significance level, there is gas mileage for the luxury sedan is at least 21 miles per gallon.