18What is the middle interval that captures 95% of the mean salaries from samples of size 40graduates.

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19Keep the error probability atα= 0.05.We want to build an interval which captures 95% ofthe sample means within ±$10,000 from the population mean.What is the minimum samplesize that would yield such an interval?

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20The population of orders for printing jobs at a print shop is approximately normal with amean of 200 pages and a standard deviation of 40 pages.The shop is almost out of paper andit has five orders that must be finished before a shipment of paper can be expected.If theshop has 1,200 sheets of paper left, what is probability that the five orders will not exhaustthe stock of paper?

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Questions 21 and 22 are related21Consider the mean cost of getting a four-year college degree.The middle interval whichcaptures 95% of mean costs from samples of 36 graduates is ($48,750, 53,650).What is thepopulation mean cost of getting a college degree?a$52,100b$51,200c$50,500d$49,900

22a217b207c197d187Questions 23-25 are related to this databusiness majors and "0" for other majors.111101100111111111111011111111101111in the previous question, suppose we want to build a middle interval which captures 95% ofthe sample means within ±$1,000 from the population mean.What is the minimum samplesize that would yield such an interval?The following binary data represent the students taking E270, where "1" is for students who arebusiness majors and "0" for other majors.