As in Exercise 19, we hope to estimate the percentage of adults aged 25 to 30 who never graduated from high school. What sample size would allow us to increase our confidence level to 95% while reducing the margin of error to only 2 % ?
Answer to relevant QuestionsEditors of the business report in Exercise 20 are willing to accept a margin of error of 4% but want 99% confidence. How many randomly selected employers will they need to contact? The data set provided contains last month’s credit card purchases of 500 customers randomly chosen from a segment of a major credit card issuer. The marketing department is considering a special offer for customers who ...Write the null and alternative hypotheses to test each of the following situations. a) A 2010 Harvard Business Review article looked at 1109 CEOs from global companies and found that 32% had MBAs. Has the percentage ...Gallup reported in 2012 that 53% of American investors are likely to say the price of energy (including gas and oil) is hurting the U.S. investment climate “a lot,” according to a Wells Fargo/Gallup Investor and ...A survey of 1000 workers indicated that approximately 520 have invested in an individual retirement account. National data suggests that 44% of workers invest in individual retirement accounts. a) Create a 95% confidence ...
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