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A sample of 20 items provides a sample standard deviation of 5.                                

A sample of 20 items provides a sample standard deviation of 5.                                                                                      a. Compute the 90% confidence interval estimate of the population variance.                                                                                        b. Compute the 95% confidence interval estimate of the population variance.                                                                        

c. Compute the 95% confidence interval estimate of the population variance.








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