A Pew Research Center poll asked 1708 randomly selected adults in the US whether “global warming is a problem that requires immediate government action.” Results showed that 55% of those said “yes.” What is the sample?

Question

BlackTom AI · Accepted Answer

The sample consists of the 1708 randomly selected U.S. adults.

1. Relevant concepts:
- Population: the entire group about which we want information (here, all U.S. adults).
- Sample: the subset of the population actually observed or surveyed (the individuals selected for the poll).
- Parameter vs. statistic: a parameter is a numerical summary of a population (unknown here); a statistic is a numerical summary of the sample (for example, the 55% who said “yes”).

2. Step-by-step reasoning:
- The poll asked a question of a group drawn from the population. The phrase “randomly selected adults in the US” identifies the sampled individuals.
- The number 1708 is the count of people included in that group. That count is the sample size and identifies the sample itself.
- The 55% figure is the result computed from the sample (a statistic), not the sample identity.

3. Intermediate steps / simple identification:
- Population: all U.S. adults (not directly observed).
- Sample size and identity: 1708 U.S. adults (those randomly selected and surveyed).
- Sample statistic: 55% of the 1708 who answered “yes.”

4. Why the correct answer is correct:
- By definition, a sample is the actual set of individuals measured; since 1708 adults were the ones surveyed, they constitute the sample. The 55% is an outcome calculated from that sample, not the sample itself.

5. Why other possible answers would be incorrect:
- “55%” would be a statistic (a proportion) derived from the sample, not the sample itself.
- “All U.S. adults” would be the population, not the sample.
- Any other phrasing that does not identify the actual surveyed individuals is incorrect.

6. Conclusion:
Therefore, the sample is 1708 U.S. adults, which matches the provided answer.

A Pew Research Center poll asked 1708 randomly selected adults in the US whether “global warming is a problem that requires immediate government action.” Results showed that 55% of those said “yes.” What is the sample?单项选择题

类似问题

A pharmaceutical company has designed an experiment to test a new arthritis drug. There were 100 subjects in the initial study. Sixty will receive the drug, 40 will receive the control. What is the sample?

Is the following statement true or false? In the products of methylation-hydrolysis, every -OH group corresponds to the position of a glycosidic bond in the starting polysaccharide.

Which of the follwoing structures represents amylopectin?

Which of the following is true about an aldopentose?I. It is a monosaccharide.II. It contains a CHO groupIII. It is a disaccharide.IV. It is an oligosaccharide.

For stock A, we have 𝛽 𝑖 = 0.70. Suppose the expected market risk premium next year is 9% and the risk-free rate is 3%. What is the expected return of this stock based on the CAPM? (Please answer in % and round to 2 decimal places. If the answer is 8.057%, then in the box, write 8.06)

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单