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Please Answer Correctly and you must use Excel and show your workings. I. A random sample of 20 purchases has a mean of $49.05 and

Please Answer Correctly and you must use Excel and show your workings.

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I. A random sample of 20 purchases has a mean of $49.05 and a standard deviation of $18.09. a) Construct a 80% 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 $19

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