Question
Suppose average Dominos delivery times are normally distributed with a standard deviation of six minutes. A random sample of 28 pizza delivery restaurants is taken
Suppose average Dominos delivery times are normally distributed with a standard deviation of six minutes. A random sample of 28 pizza delivery restaurants is taken and has a population delivery time of 33 minutes.
(a) Find a 93% confidence interval estimate for the population mean delivery time.
(b) Findan 88% confidence interval estimate for the population mean delivery time.
(c) Which confidence interval is the most accurate in estimating the population mean delivery time?
(d) Which confidence interval is the widest?
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Boundary Value Problems And Partial Differential Equations
Authors: David L Powers, Powers Shelley
6th Edition
0080884415, 9780080884417
