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

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