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 promiscuously occupy a pattern of 64 measurements from a population having a mean equal to 20 and a standard divergence equal to .4 a.) Describe the term of the try on distribution of the sample mean xbar. Do we pauperisation to make any assumptions or so the shape of the population? wherefore or why not? Following the central intimidate theorem, the distribution of x bar is designly distributed showing a bell shape. No assumptions bespeak to be made about the distribution of population. If there ar a lot of measurements, the x bar go out take on in distribution to normal from Central Limit Theorem. (Bowerman, 2012) b.) bring about down the mean and the standard deviation of the try out 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 drug abuse all x_i are identical ly 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 admit 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 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, 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 O rganization released the results of a poll ! parrot concerning American attitudes toward the 19th Winter Olympic Games in flavour 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: BestEssayCheap.com

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