Find evidence to show mean oil change time is different

Reference no: EM13149082

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 a = .05 level, is there enough evidence to show the mean oil change time is different?

Reference no: EM13149082

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Find evidence to show mean oil change time is different : Standard deviation of 8.3 minutes. Assuming normality, at the a = .05 level, is there enough evidence to show the mean oil change time is different?

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