A market research firm conducts telephone surveys with a 40% historical response rate. What is the probability that in a new sample of 400 telephone numbers, at least 150 individuals will cooperate and respond to the questions? In other words, what is the probability that the sample proportion will be at least 150/400 = .375?
Answer to relevant QuestionsIndicate which of the following situations involve sampling from a finite population and which involve sampling from an infinite population. In cases where the sampled population is finite, describe how you would construct a ...Barron’s reported that the average number of weeks an individual is unemployed is 17.5 weeks (Barron’s, February 18, 2008). Assume that for the population of all unemployed individuals the population mean length of ...Assume that the population proportion is .55. Compute the standard error of the proportion, σṕ, for sample sizes of 100, 200, 500, and 1000. What can you say about the size of the standard error of the proportion as the ...U.S. News & World Report publishes comprehensive information on America’s best colleges (America’s Best Colleges, 2009 ed.). Among other things, they provide a listing of their 133 best national universities. You would ...Advertisers contract with Internet service providers and search engines to place ads on websites. They pay a fee based on the number of potential customers who click on their ad. Unfortunately, click fraud—the practice of ...
Post your question