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9. Voluntary response polls almost always suffer from A) low bias. C) no bias. B) high bias. D) randomization. 10. The margin of error for a poll is 4%. This means that A) 4% of those sampled did not answer the question asked. B) we have 95% condence that the sample statistic is within 4% of the population parameter. C) 4% of those sampled gave the wrong answer to the question asked. D) 4% of the population was in the sample. E) the condence we have in the statistic is 4%. 11. If a sampling method is biased, then A) we need to improve the sampling method to remove the bias. B) we need to increase the sample size to remove the bias. C) we should sample from a larger population. D) the sample statistic will be close to the population parameter. E) the center of the distribution of the statistic will be close to the population parameter. 12. To reduce the variability of estimates from a simple random sample, you should A) use a smaller sample. D) use a larger sample. B) increase the bias. E) use a percent, not a count. C) use a count, not a percent. 13. Some common sources of nonsampling error in samples of human populations are A) voluntary response samples; can't contact some subjects. B) can't contact some subjects; some subjects refuse to answer. C) some subjects refuse to answer; using telephone directory as the sample frame. D) Answers A, B, and C are correct. E) None of the above 14. A simple random sample is A) any sample selected by using chance. B) any sample that gives every individual the same chance to be selected. C) a sample that gives every possible sample of the same size the same chance to be selected. D) a sample that selects equal numbers of individuals from each stratum. E) a sample that contains the same percent of each subgroup in the population