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Unformatted text preview: Chapter 9: Sampling Distributions 1. A phone-in poll conducted by a newspaper reported that 73% of those who called in liked business tycoon Donald Trump. The number 73% is a A) statistic. B) sample. C) parameter. D) population. Ans: A Section: 9.1 Sampling Distributions 2. A phone-in poll conducted by a newspaper reported that 73% of those who called in liked business tycoon Donald Trump. The unknown true percentage of American citizens that like Donald Trump is a A) statistic. B) sample. C) parameter. D) population. Ans: C Section: 9.1 Sampling Distributions 3. A survey conducted by Black Flag asked whether the action of a certain type of roach disk would be effective in killing roaches. Seventy-nine percent of the respondents agreed that the roach disk would be effective. The number 79% is a A) parameter. B) population. C) statistic. D) sample. Ans: C Section: 9.1 Sampling Distributions 4. A 1993 survey conducted by the local paper in Columbus, Ohio, one week before election day asked voters who they would vote for in the City Attorney's race. Thirty- seven percent said they would for the Democratic candidate. On election day, 41% actually voted for the Democratic candidate. The number 41% is a A) parameter. B) statistic. C) population. D) sample. Ans: A Section: 9.1 Sampling Distributions 5. The sampling distribution of a statistic is A) the probability that we obtain the statistic in repeated random samples. B) the mechanism that determines whether randomization was effective. C) the distribution of values taken by a statistic in all possible samples of the same size from the same population. D) the extent to which the sample results differ systematically from the truth. Ans: C Section: 9.1 Sampling Distributions Page 116 Chapter 9: Sampling Distributions 6. The distribution of the values taken on by a statistic in all possible samples from the same population is called A) the parameter. C) the sampling distribution. B) bias. D) a table of random digits. Ans: C Section: 9.1 Sampling Distributions 7. I flip a coin 10 times and record the proportion of heads I obtain. I then repeat this process of flipping the coin 10 times and recording the proportion of heads obtained many, many times. When done, I make a histogram of my results. This histogram represents A) the bias, if any, that is present. B) the true population parameter. C) simple random sampling. D) the sampling distribution of the proportion of heads in 10 flips of the coin. Ans: D Section: 9.1 Sampling Distributions 8. If a statistic used to estimate a parameter is such that the mean of its sampling distribution is equal to the true value of the parameter being estimated, the statistic is said to be A) random. B) biased. C) a proportion. D) unbiased....
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This note was uploaded on 03/30/2008 for the course STAT 155 taught by Professor Unknown during the Spring '07 term at UNC.
- Spring '07