The records of Yellowstone. Trucks reveal that the mean life of a set of spark plugs is 22,100 plug miles. The fleet owner miles. The distribution of the life of the plugs is approximately normal. A spark manufacturer claimed that its plugs have a mean life in excess 22,100 purchased a large number of sets. A sample of 18 miles and the standard sets revealed that the mean life was 23,400 deviation was 1,500 miles. Is there enough evidence to substantiate the manufacturer's claim at the .05 significance level? *

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