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A random sample of 21 pages is used to estimate the population variance of the number of typographical errors in a book. The sample mean and sample standard deviation are calculated as 7.34 and 5.11, respectively. Assume that the population is normally distributed.
A) Construct a 95% interval estimate of the population variance.
B) Construct a 99% interval estimate of the population variance.
C) Use your answers to discuss the impact of the confidence level on the width of the interval.
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