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A sample of 30 items provides a sample standard deviation of 14 a. Compute the 90% confidence interval estimate of the population variance (to 2 decimals). b. Compute the 95% confidence interval estimate of the population variance (to 2 decimals). C. Compute the 95% confidence interval estimate of the population standard deviation (to 1 decimal).

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33.56 <62 340.98 90Y.C(3,5b, 32048) I 6-04 。

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