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service station claims that it can give cars a grease and oil change in an average of 20 minutes while you wait. A customer who
service station claims that it can give cars a grease and oil change in an average of 20
minutes "while you wait". A customer who observed the operation over a period of several
weeks noted that for a random selections of 50 cars the mean waiting time was 21.5 minutes
with a standard deviation of 4.5 minutes. Do you believe the service station's claim? Test at a
5% level of significance.
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