The manufacturer of the X-15 steel-belted radial truck tire claims that the mean
ID: 3150948 • Letter: T
Question
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 population 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. Crosset would like to know if their experience is different from the manufacturer’s claim.
16.
value:
10.00 points
Required information
a. State the null hypothesis and the alternate hypothesis.Explanation / Answer
Crosset would like to check whether their experinec eis different from manufacturer's claim. This accounts for a two-tailed hypothesis. The manufacturer's claim is mean mileage driven before the tire is weared out is 60,000 miles.
Therefore,
H0:mu=60,000 (Population mean mileage is same as that of sample)
H1: mu not equal to 60,000 (population mean mileage is different from that of sample)
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