Suppose that a random sample of 142 graduate-admissions personnel was asked what role scores on standardized tests (such as the GMAT or GRE) play in the consideration of a candidate for graduate school. Of these sample members, 87 answered "very important." Find a 95% confidence interval for the population proportion of graduate admissions personnel with this view.
Answer to relevant QuestionsIn a random sample of 95 manufacturing firms, 67 indicated that their company attained ISO certification within the last two years. Find a 99% confidence interval for the population proportion of companies that have been ...In a presidential election year, candidates want to know how voters in various parts of the country will vote. Suppose that 1 month before the election a random sample of 540 registered voters from one geographic region is ...LDS wants to be sure that the leak rate (in cubic centimeters per second) of transmission oil coolers (TOCs) meets the established specification limits. A random sample 50 TOCs is tested, and the leak rates are recorded in ...Assume simple random sampling. Calculate the 95% confidence interval estimate for the population mean for each of the following. a. N = 1200; n = 80; s = 10; x = 142 b. N = 1425; n = 90; s2 = 64; x = 232.4 c. N = 3200; n = ...A senior manager, responsible for a group of 120 junior executives, is interested in the total amount of time per week spent by these people in internal meetings. A random sample of 35 of these executives was asked to keep ...
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