Question: A sample of 20 observations is selected from a normal population. The sample standard deviation is 26.25, and the sample mean is 75. a. Determine

A sample of 20 observations is selected from a normal population. The sample standard deviation is 26.25, and the sample mean is 75.

a.Determine the standard error of the mean.(Round the final answer to 4 decimal places.)

The standard error of the mean is_____.

b.Determine the 90% confidence interval for the population mean.(Round the final answers to 2 decimal places.)

The 90% confidence interval for the population mean is between_____and ______.

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

detailed steps please

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