A simple random sample of 400 from a total 1,395 colleges in the United States maintained that 39 colleges use the text Statistics Made Difficult and Boring. Find a 95% confidence interval for the proportion of all colleges using this text.
Answer to relevant QuestionsA business school dean is contemplating proposing a change in the requirements for graduation. At present, business majors are required to take one science course, chosen from a list of possible courses. The proposal is that ...How large a sample is needed to estimate the population proportion for each of the following? a. ME = 0.05; α = 0.01 b. ME = 0.05; α = 0.10 c. Compare and comment on your answers to parts a and b. Determine the sample size for each of the following situations. a. N = 2,500 p` = 0.5 1.96spn = 0.05 b. N = 2,500 p` = 0.5 1.96spn = 0.03 c. Compare and comment on your answers to part a and part b. Everyone knows that exercise is important. Recently, employees of one large international corporation were surveyed and asked, How many minutes do you spend daily on some form of rigorous exercise? From a random sample of 25 ...The following data represent the number of passengers per flight in a random sample of 20 flights from Vienna, Austria, to Cluj-Napoca, Romania, with a new airline: a. What is the reliability factor for a 90% confidence ...
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