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.© BrainMass Inc. brainmass.com June 3, 2020, 10:42 pm ad1c9bdddf
H0: m = 15
Ha: m =/ 15
Two-tailed t- test for a population mean at a = 0.05
Degrees of ...
The p-value for concept approaches are determined. A complete, neat and step-by-step solution is provided.