3. Jiffy lube advertises a 30 minute oil change. A sample of 35 customers showed a mean change time of 34 and a standard deviation of 8.3 minutes. Assuming normality, at the α = .05 level, is there enough evidence to show the mean oil change time is different?© BrainMass Inc. brainmass.com June 3, 2020, 10:45 pm ad1c9bdddf
The solution provides step-by-step method for the calculation of the Z-test statistic and P-value. Formula for the calculation and Interpretations of the results are also included in both doc and pdf format.