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3.   The mean delivery time is 36 minutes and the population standard deviation is six minutes....

3.   The mean delivery time is 36 minutes and the population standard deviation is six minutes. Assume the sample size is 81 restaurants with the same sample mean. Find a 90% confidence interval estimate for the population mean delivery time.

6.If in a sample of size n=49 selected normal population, the sample mean X=48 and population standard deviation is 21, what is your statistical decision, if your H0 :µ = 45, α=0.05

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