Week 3 Assignments

Week 3 Assignments Debra Shaffer BUS308 Travis Hayes May 14, 2012 Week 3 Assignments 7.11; sound out that we go away arbitrarily ask a ingest of 64 measurements from a population having a mean equal to 20 and a standard digression equal to .4 a.) Describe the term of the take in distribution of the sample mean xbar. Do we pauperisation to make any assumptions or so the shape of the population? why or why not? Following the central intimidate theorem, the distribution of x bar is designly distributed showing a bell shape. No assumptions sine qua non to be made about the distribution of population. If there argon a lot of measurements, the x bar go out come across in distribution to normal from Central Limit Theorem. (Bowerman, 2012) b.) happen upon the mean and the standard deviation of the have distribution of the sample mean x-. Mean (x bar) = 1/n sum from 1 to n mean(x_i) = 1/n * n * mean (x_1) beca physical exertion in all x_i are identicall y 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 will keep back a sample mean great than 21; judge P(xbar>21). z value = (21 - 20) * 2 = 2 P(Z > 2) = 0.02 sampling distribution is bell-shaped curve. the curve is centered at 20. you solid 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, calculate 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 canvass concerning American attitudes toward the 19! th Winter Olympic Games in sodium chloride 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.)Suppose we longing to use the polls results to justify the claim that more than than 30 percent of Americans (18 years or older) say that figure...If you wish to recrudesce a full essay, order it on our website: OrderEssay.net

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