Question: 14.20. Suppose that X has distribution N(, 4). A sample of size 25 yields a sample mean =78.3. Obtain a 99-percent (two-sided) confidence interval for

14.20. Suppose that X has distribution N(, 4). A sample of size 25 yields a sample mean =78.3. Obtain a 99-percent (two-sided) confidence interval for .

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