Question: The width of a confidence interval is defined to be the upper bound of the confidence interval minus the lower bound of the confidence interval.
The width of a confidence interval is defined to be the upper bound of the confidence interval minus the lower bound of the confidence interval. For example, if a confidence interval is(2.34,9.87), then the width of this confidence interval is9.87(2.34)=12.21. Assume that we are estimating the mean of a population. Assuming that the confidence coefficient, the sample mean and sample standard deviation stay the same, if we decrease the the sample size of a confidence interval from 100 to 50, then the width of that confidence interval will also decrease.
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