Question: 4. A sample of 40 observations is selected from a normal population where the population standard deviation is 25. The sample mean is 75. a.

4. A sample of 40 observations is selected from a normal population where the population standard deviation is 25. The sample mean is 75.

a. Determine the standard error of the mean.

b. Determine the 90% confidence interval for the population mean.

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

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