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22:37
Estimating Population Means (Small Samples): Part 1
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Suppose you own a plumbing repair business and employ 15 plumbers.You are interested in estimating the difference in the average number of calls completed per day between two of the plumbers.A random sample of 40 days of plumber A's work results in a sample average of 5.1 calls,with a population variance of 1.96.A random sample of 37 days of plumber B's work results in a sample mean of 6.5 calls, with a population variance of 2.35.Use this information and a 95% level of confidence to estimate th
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A university administrator wishes to estimate within ±0.05 and with 90 percent confidence the proportion of students enrolled in M.B.A. programs who also have undergraduate degrees in business. What sample size should be collected, as a minimum, if there is no basis for estimating the approximate value of the proportion before the sample is taken? Using formula (9,11), n=((z)/(2 E))^2=((1.645)/(2(0.05)))^2=(16.45)^2=270.60 ≅271 | Numerade
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