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Hypothesis Testing for an Oil and Lube Service

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(TCO 11) A 15-minute Oil and Lube service claims that their average service time is no more than 15 minutes. A random sample of 40 service times was collected, and the sample mean was found to be 15.4 minutes, with a sample standard deviation of 3.2 minutes. Is there evidence to support, or to reject the claim at the alpha = 0.02 level?

Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.

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A 15-minute Oil and Lube service claims that their average service time is no more than 15 minutes. A random sample of 40 service times was collected, and the sample mean was found to be ...

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  • MSc, Meerut University
  • MPhil, Institute of Advanced Studies
  • MSc, AIT
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