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 randomly take on a experiment of 64 measurements from a population having a mean equal to 20 and a standard excursus equal to .4 a.) Describe the term of the archetype 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 hire to be made about the distribution of population. If there are a lot of measurements, the x bar for submit touch in distribution to normal from Central Limit Theorem. (Bowerman, 2012) b.) ferret out the mean and the standard deviation of the consume 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 persona totally x_i are identically and separat ely distributed. = mean (x_1) = mean(x) = 20 sd(x-) = sd(x)/ sqrt(n) = 4/8 = 1/2 c.) Calculate the chance that we will obligate 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 substantial 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 pennant concerni ng American attitudes toward the 19th Winter! Olympic Games in saltiness 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 get a full essay, order it on our website: OrderEssay.net

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