# Statistics - P-value Concept Approach

The Speedy Oil Change Company advertised a 15-minute wait for an oil change. A sample of 23 oil changes showed a mean time of 16.5 minutes and a standard deviation of 4.3 minutes. At the 5% level of significance, is there evidence that the mean time for an oil change is different from 15 minutes? Assume the population is approximately normal. Use the p-value approach.

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#### Solution Preview

H0: m = 15

Ha: m =/ 15

Two-tailed t- test for a population mean at a = 0.05

Degrees of ...

#### Solution Summary

The p-value for concept approaches are determined. A complete, neat and step-by-step solution is provided.

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