Concept explainers
Expand Your knowledge: Stratified Sampling and Politics Three local districts are “swing" districts for an upcoming election on a contentious political issue. A survey will be conducted in which voters will he asked to rate their opinion regarding this issue on a scale of 0 (strongly oppose) to 10 (strongly support). A small preliminary random sample from each district was used to estimate the sample standard deviation’s of responses for the district. The following table slums the number of voters N in each district and the sample standard deviation’s of strength of support in each district.
District 1 | District 2 | District 3 |
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We have a total population of 5332 voters and 3 strata (districts).
The group doing the survey has enough funding to obtain a random sample of m = 250 total responses from all the districts.
(a) Compute the size of the random samples
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Understanding Basic Statistics
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill