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The Pew Research Center conducted a survey of 45,535 adults in 40 countries to learn about major concerns for the future (Pew Research Center website, December 5, 2015). The survey results showed that 20,901 of the respondents are very concerned about climate change.
a. What is the point estimate of the population proportion of adults who are very concerned about climate change?
b. At 90% confidence, what is the margin of error?
c. Develop a 90% confidence interval for the population proportion of adults who are very concerned about climate change.
d. Develop a 95% confidence interval for the population proportion of adults who are very concerned about climate change. |
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