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what is the confidence interval?

Statistics
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The amount of time customers at a “Quick-Change” motor oil store spend waiting for their cars to be serviced has the Normal distribution with mean μ and standard deviation σ = 4 minutes. It is company policy that the customer wait time should be 20 minutes (or less). The manager of a particular store selects a random sample of 150 customer wait times and observes a mean wait time of 21 minutes. 


A 95% confidence interval for the mean waiting time for customers is about?

Apr 20th, 2015

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Apr 20th, 2015

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