The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. Assume the mileage wear follows the normal distribution and the standard deviation of the distribution is 5,000 miles. Crosset Truck Company bought 48 tires and found that the mean mileage for its trucks is 59,500 miles.

(b)State whether the decision rule is true or false: Reject H0 if z < -1.96 or z > 1.96 using a 0.05 significance level.

True

False

(f)Is Crosset’s experience different from that claimed by the manufacturer at the .05 significance level?

Yes

No