A sample of 350 orders for take-out food at a local pizzeria found that the average cost

| August 30, 2017

Question
A sample of 350 orders for take-out food at a local pizzeria found that the average cost of an order was $22 with s=$14

a, What us the margin of error if we use a 95% confidence interval, for the average cost of an order?

b. Interpret for management the margin of error

c. If we need to be 99% confident, does the confidence interval become wider or narrower?

d. Find the 99% confidence interval

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