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Business, 13.12.2019 04:31 sarahjdeering

Records on a fleet of trucks reveal that the average life of a set of spark plugs in normally distributed with a mean of 22,100miles. the fleet owner purchased 18 sets and found that the sample average life was 23,400 miles; the sample standard deviation was 1,412 miles. to determine if the spark plugs average 22,100 miles, what is the critical value for the test using a 0.05 level of significance?

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