Now look at the entire population of salaries, which you can’t usually do in real life.
a. Find the population mean and standard deviation, and compare them to the sample estimates from the previous problem.
b. Draw a graph for this situation in the style of Figure 9.1.1. Be sure to use σX as the standard deviation of the sampling distribution.
c. Is the population mean in the confidence interval (from exercise 1) in this case? Will it always be in the interval, for all random-samples? Why or why not?

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