A random sample of 20 purchases showed the amounts in the table (in $). The mean is $50.03 and the standard deviation is $18.67. 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

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Related Book For  answer-question

Business Statistics

3rd edition

Authors: Norean Sharpe, Richard Veaux, Paul Velleman

ISBN: 978-0321925831