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A sample of 28 observations is selected from a normal population where the sample standard deviation...

A sample of 28 observations is selected from a normal population where the sample standard deviation is 5.00. The sample mean is 16.95.  

a. Determine the standard error of the mean. (Round the final answer to 2 decimal places.)

The standard error of the mean is.

b. Determine the 95% confidence interval for the population mean. (Round the t-value to 3 decimal places. Round the final answers to 3 decimal places.)

The 95% confidence interval for the population mean is between and.


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

(Click to select)  Increase  Decrease

Math   Statistics-And-Probability   
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