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29. The mean preparation fee H&R Block charged retail customers last year was $183 mit Wall Street Journal, March 7, 2012). Use this price as the population mean and assume the bpopulation standard deviation of preparation fees is $50.
a. What is the probability that the mean price for a sample of 30 H&R Block retail customers is within $8 of the population mean?b. What is the probability that the mean price for a sample of 50 H&R Block retail customers is within $8 of the population mean?c. What is the probability that the mean price for a sample of 100 H&R Block retail customers is within $8 of the population mean?d. Which, if any, of the sample sizes in parts (a), (b), and (c) would you recommend to have at least a .95 probability that the sample mean is within $8 of the population mead
51. 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?
52. Advertisers contract with Internet service providers and search engines to place ads or
the state agriculture department asked random samples of indiana farmers in each county whether they favored a
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If sensitivity and specificity remain constant, determine the relationship of prevalence to predictive value positive and predictive value negative?
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1. using the data collected from the student data survey at the beginning of the course construct a
A state lottery involves the random selection of six different numbers between 1 and 28. If you select one six number combination, what is the probability that it will be the winning combination?
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