(See Steps) A spark plug manufacturer claimed that its plugs have a mean life in excess of 22,100 miles. Assume the life of the spark plugs follows the
Question:
A spark plug manufacturer claimed that its plugs have a mean life in excess of 22,100 miles.
Assume the life of the spark plugs follows the normal distribution. A fleet owner purchased
a large number of sets. A sample of 18 sets revealed that the mean life was 23,400 miles
and the standard deviation was 1,500 miles. Is there enough evidence to substantiate the
manufacturer’s claim at the .05 significance level?
Deliverable: Word Document 
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