Bus 308 Week 3

Week 3 Assignment Kati Palmer BUS308: Statistics for Managers Dr. Ali A. Choudhry December 19, 2011 Week 3 Assignment 7.11 cypher that we go away randomly set apart a hear of 64 measurements from a creation having a look on equal to 20 and a standard deviation equal to 4. a. Describe the fake of the ingest distribution of the audition mean lay off x. Do we need to make every assumptions about the shape of the population? Why or why not? The shape of the consume distribution of the sample mean bar x bequeath be normal because in that respect is a normal distribution. The rudimentary Limit Theorem can be used since the sample is great than 30. This eliminates the need to make assumptions. b. go on the mean and the standard deviation of the take in distribution of the sample mean of bar x. entertain = 20 (given in the question) bar deviation = 4/?64 Standard deviation = 4/ 8 Standard deviation = 0.5 c. Calculate the fortune that we will incur a sample mean great than 21; that is, manoeuver P(x > 21). Hint: Find the z hold pricy corresponding to 21 by using ? and ? because we wish to calculate a probability about x. Then sketch the sampling distribution and the probability Z = (21-20)/ (4/?64) Z = 1/0.5 Z = 2 P (z>2) P = 1-0.9772 P = 0.0228 d. Calculate the probability that we will obtain a sample mean little than 19.385 ; that is calculate P(x.< 19.385). Z = (19.385 - 20)/ (4/?64) Z = -0.615 / 0.5 Z = -1.23 P = 0.1093 7.30 On February 8, 2002, the Gallup Organization released the results of a analyse concerning American attitudes toward the 19th overwinter Olympic Games in Salt Lake City, Utah. The poll results were based on telephone interviews with a randomly selected national sample of 1,011 adults, 18 years and older, conducted February 4-6, 2002. a. sound out we wish to use the polls results to justify the form of address that more than 30 percen t of Americans (18 years or older) allege t! hat figure skate is their...If you want to get a broad(a) essay, order it on our website: OrderCustomPaper.com

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