A union representative has collected some data on the hourly pay of workers in the area. He is curious to find out if hourly pay actually increases with age. He does not have the actual ages of the workers in his sample, but he does have age group information. For now, he wishes to compare the young workers (18-30 years old) with the middle aged workers (31-45 years old) by calculating a confidence interval for the difference in population mean salaries. How would the 99 confidence interval for the difference in average hourly pay compare to the 90 confidence interval?
Question 2
A television station plans to ask a random sample of 400 city residents if they can name the news anchor on the evening news at their station. They plan to fire the news anchor if fewer than 10 of the residents in the sample can do so. Suppose that in fact 12 of city residents could name the anchor if asked. What is the approximate probability that the anchor will be fired?
a. 0.02
b. 1.23
c. 0.11
d. 0.89
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