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3. A random sample of 61 observations has a mean of 1460 with a standard deviation of 121 (known ). Find a 99% confidence

3. A random sample of 61 observations has a mean of 1460 with a standard deviation of 121 (known ). Find a 99% confidence interval for the population mean. (Using z-table for the solution) a. The 99% confidence interval for the population mean is (1420.11, 1569.91) b. The 99% confidence interval for the population mean is (1420.11, 1499.89) c. The 99% confidence interval for the population mean is (1350.10, 1569.91) d. The 99% confidence interval for the population mean is (1350.10, 1499.89)

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