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Chapter 9

# Chapter 9 - Chapter 9 Sampling Distributions 1 A phone-in...

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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 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 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 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

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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 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
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