A car company wishes to test the claim that at an average of 55 mph, the stopping distance for auto brakes is 130 ft. In a random sample of 19 individuals that were tested for their breaking distance were recorded, a sample mean of 114 ft. and with a standard deviation is recorded as 20 ft. At the 10% level of significance, test the claim that the stopping distance for a car traveling at 55 mph is different than the stated 130 ft.

What is the Null hypothesis (H0); Alternate hypothesis (H1); and the direction of the test?

Answers:

A) mu=130; mu<>130; Two Tail Test

B) mu=130; mu>130; left tail Test

C) mu=130; mu<130; right tail Test

D) mu=130; mu<130; two tail Test

Which distribution is used in this case?

What is the critical value?

What is the Test Statistic Value?

What is the P-value?

What is the conclusion of the test?