%) A manager of an e-commerce company would like to determine
the average delivery time of the products. A sample of 20 customers
is taken. "The average delivery time in the sample was five days.
Suppose the delivery times are normally distributed with a standard
deviation of 1.4 days." c) Test the manager’s claim at 95 %
confidence level.
mean of the sample test is 4 days
%) A manager of an e-commerce company would like to determine the average delivery time of the products. A sample of 20
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%) A manager of an e-commerce company would like to determine the average delivery time of the products. A sample of 20
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