A Population Proportion · Exercise 47
A polling group recently conducted a survey asking adults across the United States about music preferences. When asked, 80 of the 571 participants download music weekly.
(a) Create a 99 percent confidence interval for the true proportion of American adults who download music weekly.
(b) This survey was conducted through automated telephone interviews on May 6 and 7, 2013. The error bound of the survey compensates for sampling error, or natural variability among samples. List some factors that could affect the survey’s outcome that are not covered by the margin of error.
(c) Without performing any calculations, describe how the confidence interval would change if the confidence level decreased from 99 percent to 90 percent.
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OpenStax, Statistics · §8.3 A Population Proportion · Exercise 47
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