A philanthropic organization knows that its donors have an average age near 60 and is considering taking out an ad in the American Association of Retired People (AARP) magazine. An analyst wonders what proportion of their donors are actually 50 years old or older. He takes a random sample of the records of 500 donors. From the data provided, construct a 95% confidence interval for the proportion of donors who are 50 years old or older.
Answer to relevant QuestionsFor each situation below identify the population and the sample and identify p and p if appropriate and what the value of p is. Would you trust a confidence interval for the true proportion based on these data? Explain ...Have harsher penalties and ad campaigns increased seat-belt use among drivers and passengers? Observations of commuter traffic have failed to find evidence of a significant change compared with three years ago. Explain what ...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 ...Gallup previously found that the percent of Americans who worry a great deal or a fair amount about global warming was 60% in 2009. Do the responses in this problem and Exercise 29 give evidence that concerns for global ...A national real estate magazine advertised that 15% of first-time home buyers had a family income below $40,000. A national real estate firm believes this percentage is too low and samples 100 of its records. The firm finds ...
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