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题目
题目
单项选择题

Question at position 2  The website of a city newspaper places opinion poll questions next to many of its news stories. Simply click your response to join the sample. One of the questions was “Do you plan to diet this year?” More than 30,000 people responded, with 88% saying “Yes.” Which of the following is true?About 88% of all residents of the city plan to diet this year.The poll used a voluntary response sample and the proportion of all city residents who plan to diet this year is likely to be less than 88%. The poll used a voluntary response sample and the proportion of all city residents who plan to diet this year is likely to be greater than 88%. The poll used a convenience sample and the proportion of all city residents who plan to diet this year is likely to be greater than 88%. The poll used a convenience sample and the proportion of all city residents who plan to diet this year is likely to be less than 88%.

选项
A.About 88% of all residents of the city plan to diet this year.
B.The poll used a voluntary response sample and the proportion of all city residents who plan to diet this year is likely to be less than 88%.
C.The poll used a voluntary response sample and the proportion of all city residents who plan to diet this year is likely to be greater than 88%.
D.The poll used a convenience sample and the proportion of all city residents who plan to diet this year is likely to be greater than 88%.
E.The poll used a convenience sample and the proportion of all city residents who plan to diet this year is likely to be less than 88%.
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思路分析
The scenario involves collecting opinions via a voluntary response sample attached to a news site. This type of sampling is prone to bias because people who feel strongly about a topic are more likely to respond, while those with weaker opinions may skip it. Now, evaluate each option: Option 1: About 88% of all residents of the city plan to diet this year. This statement claims the sample proportion directly reflects the population proportion. It ignores potential sampling bias. Since the data come from voluntary responses, it is not reasonable to assume the sample perfectly matches the population; therefore this option is not the most defensible conclusion. Option 2: The poll ......Login to view full explanation

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