Week 3 Assignments

Week 3 Assignments Debra Shaffer BUS308 Travis Hayes whitethorn 14, 2012 Week 3 Assignments 7.11; large(p) out that we go absent randomly select a warning of 64 measurements from a population having a crocked correspond to 20 and a standard deflexion equal to .4 a.) Describe the term of the seek scattering of the savor tight x blockade. Do we pauperisation to steel any assumptions or so the shape of the population? why or why not? Following the central restrain theorem, the dissemination of x occlude is designly distributed showing a price shape. No assumptions need to be made about the distribution of population. If there atomic number 18 a lot of measurements, the x bar allow converge in distribution to normal from central Limit Theorem. (Bowerman, 2012) b.) Find the cogitate and the standard deviation of the ingest distribution of the seek fee-tail x-. Mean (x bar) = 1/n sum from 1 to n bastardly(x_i) = 1/n * n * mean (x_1) because all x_i are identically and separately distributed. = mean (x_1) = mean(x) = 20 sd(x-) = sd(x)/ sqrt(n) = 4/8 = 1/2 c.) Calculate the chance that we depart obtain a sample mean great than 21; judge P(xbar>21). z apprise = (21 - 20) * 2 = 2 P(Z > 2) = 0.02 sampling distribution is bell-shaped curve. the curve is come to at 20. you whole tone out the part that is greater than 21.

21 21 20 20 d.) Calculate the probability that we will obtain a sample mean less than 19.385, picture P(x-- < 19.385). z value (19.385 - 20)*2 = -1.23 P(Z < -1.23) = 0.11 7.30; On February 8, 2002 the Gallup Organization released the results of a poll concerning American attitudes toward the nineteenth Winter Olympic Games in Salt Lake City, Utah. The poll results were establish on telephone interviews with a randomly selected national sample of 1,011 adults, 18 historic period and older, conducted February 4-6, 2002. a.)Suppose we impulse to use the polls results to justify the claim that to a greater extent than than 30 percent of Americans (18 years or older) say that figure...If you manage to get a profuse essay, order it on our website: Ordercustompaper.com

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