Toyoku, a manufacturer of four-wheel drive vehicles claims that drivers can travel an average of 150 miles or more over rough terrain in an 8-hour day in their vehicles. Hondo, a competitor suspects that Toyoku is over-estimating the performance of its vehicles and wants to take legal action against Toyoku. It hires an independent testing agency to verify Toyoku's claim. The testing agency drove a sample of 18 vehicles and found that the average number of miles driven over rough terrain was 145 miles over the 8-hour day, with a sample standard deviation of 8.3 miles ( Answer questions Q10 - 14 using this data). 10

10. What is the appropriate null and alternative hypothesis?

11.What is the value of the standardized test statistic?

a. 0.27

b. -0.27

c. 2.55

d. -2.55

e. -6.02

12 What is the standard error of the estimate?

a. 1.96

b. 4.24

c. 0.60

d. 8.30

e. 68.89

13 What is the critical Value is a= 0.05

please show how you got the answer, i am having trouble understanding the steps