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From a normal population, a sample of 230 observations is selected. The population standard deviation is...

From a normal population, a sample of 230 observations is selected. The population standard deviation is 26, and the sample mean is 18.

a.

Determine the standard error of the mean. (Round your answer to 3 decimal places.)

b.

Determine the 99% confidence interval for the population mean. (In your calculations: round your z/t value to 2 decimals, but round all other values to 3 decimals. Round your final answer to 3 decimal places.)

Math   Statistics-And-Probability   
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