Question: For the purchase amounts in Exercise 8: a) Construct a 90% confidence interval for the mean purchases of all customers, assuming that the assumptions and

For the purchase amounts in Exercise 8:

a) Construct a 90% confidence interval for the mean purchases of all customers, assuming that the assumptions and conditions for the confidence interval have been met.

b) How large is the margin of error?

c) How would the confidence interval change if you had assumed that the standard deviation was known to be $20?

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a To find the confidence interval use y t n 1 SE y where SE y s n 4526 1729 ... View full answer

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