Question: Repeat exercise 1 parts b and c using a 90

Repeat exercise 1, parts b and c, using a 90% confidence interval. Is the population mean annual salary in the interval?
a. Find the average, standard deviation, and standard error for annual salary based on this sample.
b. Find the 95% confidence interval for the population mean salary.
c. Draw a graph in the style of Figure 9.1.5 indicating the sample average and confidence interval.

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