A confidence interval for the difference between the means of two normally distributed populations based on the
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Before After
6 ............ 8
12 ................14
8 ............ 9
10 ................13
6 ................. 7
a. Find the margin of error for a 90% confidence level.
b. Find the UCL and the LCL for a 90% confidence level.
c. Find the width of a 95% confidence interval.
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Related Book For
Statistics For Business And Economics
ISBN: 9780132745659
8th Edition
Authors: Paul Newbold, William Carlson, Betty Thorne
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