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Round-Off Rule for Confidence
Intervals Used to Estimate µ
1. When using the original set of data, round the
confidence interval limits to one more decimal
place than used in original set of data.
2. When the original set of data is unknown and only
the summary statistics (n, x, s) are used, round the
confidence interval limits to the same number of
decimal places used for the sample mean.
Copyright © 2010, 2007, 2004 Pearson Education, Inc. All Rights Reserved.
7.1 - 59
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