A shop manual gives 6.5 hours as the average time required, Ask an Expert

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A shop manual gives 6.5 hours as the average time required to perform a 30,000 mile major maintenance service on a Porsche 911. Last month a mechanic performed 11 such services, and his required times were as follows.

6.3 6.6 6.7 5.9 6.3 6.0 6.5 6.1 6.2 6.4 6.3

At the 2% level of significance, is there sufficient evidence to conclude that the mechanic can perform this service in less time than specified by the service manual?

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Statistics and Probability, Statistics

Category:- Statistics and Probability
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