# 统计作业.pdf - Test 7A AP Statistics Name: Part 1: Multiple...

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Test 7AAP StatisticsName:Part 1:Multiple Choice.Circle the letter corresponding to the best answer.1.Following a dramatic drop of 500 points in the Dow Jones Industrial Average in September1998, a poll conducted for the Associated Press found that 92% of those polled said that a yearfrom now their family financial situation will be as good as it is today or better.Which of thefollowing terms describes the number 92%?(a) statistic.(b) sample.(c) sample parameter.(d) population parameter.(e) population.
2.What is distribution of values taken by a statistic in all possible samples of the same size fromthe same population called?
3.If a statistic used to estimate a parameter is such that the mean of its sampling distribution isequalto the true value of the parameter being estimated, what is the statistic said to be?
4.Suppose you take a random sample of size 25 from a population with mean of 120 and astandard deviation of 15.Your sample has a mean of 115 and a standard deviation of 13.8.Which of the following has a mean of 120 and a standard deviation of 3?
© 2011 BFW PublishersThe Practice of Statistics, 4/e- Chapter 7321
5.In order to use the formulanto calculate the standard deviation of the samplingdistribution of the sample mean, which of the following conditions must be met?I.30nII.The population’s distribution is approximately Normal.III. The sample size is less than 10% of the population size.X(a) I only(b) II only(c) III only(d) III andeitherI or II(e) All three conditions must be met.
6.The central limit theorem refers to which of the following characteristic of the samplingdistribution of the sample mean?.
322The Practice of Statistics, 4/e- Chapter 7© 2011 BFW Publishers

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