A. draw the shape of the sampling diffusion of the archetype mean x. Do we need to make any assumptions about the shape of the population?
B. Find the mean and the standard deviation of the sampling distribution of the sample mean x
C. Calculate the probability that we will stupefy a sample mean greater than 21; that is, manoeuvre P(x > 21).
D. Calculate the probability that we will obtain a sample mean less than 19.385; that is, lick P(x < 19.385)
7.30 On February 8, 2002, the Gallup Organization released the results of a survey concerning Americans attitudes toward the 19th Winter exceeding Games in salinity 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 craving to use the polls results to justify the claim that more than than 30 percent of American (18 years or older) tell a ramify that figure glide is their favorite winter Olympic event. The poll actually found that 32 percent of respondent inform that figure skating was their favorite event.
If, for the sake of argument, we assume that 30 percent of Americans (18 years or older) say figure skating is their favorite event (that is, p = .3), calculate the probability of law-abiding a sample proportion of .32 or more; that, calculate P (p > .32)
B. Based on the probability you computed in part a, would you conclude that more than 30 percent of Americans (18 years or older) say that figure skating is their favorite Winter Olympic events?
8.8 THE BANK CUSTOMER WAITING TIME CASE
Recall that till manager has developed a new system to sign up the time customers spend waiting to be served by vote counter during flyer business hours. The mean waiting time during peak business hours under the current system is roughly 9 to 10 minutes....If you want to get a full essay, ordering it on our website: Ordercustompaper.com
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