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 opt a specimen of 64 measurements from a creation having a look upon equal to 20 and a standard fluctuation equal to 4. a. Describe the fake of the ingest distribution of the example mean measurement x. Do we need to make both assumptions about the shape of the population? Why or wherefore not? The shape of the consume distribution of the sample mean bar x volition be normal because on that point 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. set the mean and the standard deviation of the taste 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. Calcula te the fortune that we will incur a sample mean great than 21; that is, weigh P(x > 21). Hint: Find the z hold just 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 o f a crownwork concerning American attitudes! toward the 19th pass 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 percent of Americans (18 years or older) allege that figure glide is their...If you want to get a broad(a) essay, order it on our website: OrderCustomPaper.com

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