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A sample of 29 observations is selected from a normal population where the population standard deviation...

A sample of 29 observations is selected from a normal population where the population standard deviation is 40. The sample mean is 89.  

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

The standard error of the mean is  .

b. Determine the 98% confidence interval for the population mean. (Round the z-value to 2 decimal places. Round the final answers to 3 decimal places.)

The 98% confidence interval for the population mean is between  and  .

c. If you wanted a wider interval, would you increase or decrease the confidence level?

(Click to select)  Increase  Decrease

Math   Statistics-And-Probability   
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