Explain how to take a systematic sample of 100 companies from the 1,853 companies that are members of an industry trade association.
Answer to relevant QuestionsExplain why it is important to calculate a confidence interval. Using Table A. 4 (page 608), find t.100, t .025, and t.001 based on 11 degrees of freedom. Also, find these t points based on 6 degrees of freedom. The mean and the standard deviation of the sample of 100 bank customer waiting times in Table are 5.46 and 2.475, respectively. Calculate a t-based 95 percent confidence interval for μ, the mean of all possible bank ...Referring to Exercise 8.21 (page 307), regard the sample of five trial runs (which has standard deviation 19.65) as a preliminary sample. Determine the number of trial runs of the chemical process needed to make us: In ...In an article in the Journal of Advertising, Weinberger and Spotts compare the use of humor in television ads in the United States and the United Kingdom. They found that a substantially greater percentage of U.K. ads use ...
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