A polling website publishes the results of a new survey each day. At the end of the survey results, you'll find a statement that includes an explanation such as the one shown below. Complete parts a and b below. These results are based on face-to-face interviews with 1,000 adults, aged 15 and older, conducted in 2015 in several countries. For results based on the total sample of national adults, one can say with 95% confidence that the maximum margin of sampling error ranges from +3.4 percentage point to 4.0 percentage points. The margin of error reflects the influence of data weighting. In addition to sampling error, question wording and practical difficulties in conducting surveys can introduce error or bias into the findings of public opinion polls. a) The website is interested in the opinions of residents of a certain region. What kind of survey design are they using? O A. Multistage sampling O B. Stratified random sampling OC. Cluster sampling O D. Simple random sampling b) Some of the countries surveyed have large populations. (One country surveyed is estimated to have over 50 million people.) Some are quite small. (Another country surveyed has fewer than 13,000,000 people.) If the website sampled 1000 adults in each country, how does this affect the precision of its estimates for these countries? O A. The countries with a smaller population will have a more accurate estimate because a larger percentage of the population is included in the sample. O B. The countries with a larger population will have a more accurate estimate because a smaller percentage of the population is included in the sample. OC. The countries with a smaller population will have a less accurate estimate because a larger percentage of the population is included in the sample. O D. The difference in population size has no effect whatever on the precision of estimates from these surveys. Only the sample size matters.
A polling website publishes the results of a new survey each day. At the end of the survey results, you'll find a statement that includes an explanation such as the one shown below. Complete parts a and b below. These results are based on face-to-face interviews with 1,000 adults, aged 15 and older, conducted in 2015 in several countries. For results based on the total sample of national adults, one can say with 95% confidence that the maximum margin of sampling error ranges from +3.4 percentage point to 4.0 percentage points. The margin of error reflects the influence of data weighting. In addition to sampling error, question wording and practical difficulties in conducting surveys can introduce error or bias into the findings of public opinion polls. a) The website is interested in the opinions of residents of a certain region. What kind of survey design are they using? O A. Multistage sampling O B. Stratified random sampling OC. Cluster sampling O D. Simple random sampling b) Some of the countries surveyed have large populations. (One country surveyed is estimated to have over 50 million people.) Some are quite small. (Another country surveyed has fewer than 13,000,000 people.) If the website sampled 1000 adults in each country, how does this affect the precision of its estimates for these countries? O A. The countries with a smaller population will have a more accurate estimate because a larger percentage of the population is included in the sample. O B. The countries with a larger population will have a more accurate estimate because a smaller percentage of the population is included in the sample. OC. The countries with a smaller population will have a less accurate estimate because a larger percentage of the population is included in the sample. O D. The difference in population size has no effect whatever on the precision of estimates from these surveys. Only the sample size matters.
MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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Transcribed Image Text:A polling website publishes the results of a new survey each day. At the end of the survey results, you'll find a statement that includes an explanation such as the one shown below.
Complete parts a and b below.
These results are based on face-to-face interviews with 1,000 adults, aged 15 and older, conducted in 2015 in several countries. For results based on the total sample of national
adults, one can say with 95% confidence that the maximum margin of sampling error ranges from +3.4 percentage point to 4.0 percentage points. The margin of error reflects the
influence of data weighting. In adition to sampling error, question wording and practical difficulties in conducting surveys can introduce error or bias into the findings of public
opinion polls.
.....
a) The website is interested in the opinions of residents of a certain region. What kind of survey design are they using?
A. Multistage sampling
B. Stratified random sampling
C. Cluster sampling
D. Simple random sampling
b) Some of the countries surveyed have large populations. (One country surveyed is estimated to have over 50 million people.) Some are quite small. (Another country surveyed has
fewer than 13,000,000 people.) If the website sampled 1000 adults in each country, how does this affect the precision of its estimates for these countries?
A. The countries with a smaller population will have a more accurate estimate because a larger percentage of the population is included in the sample.
O B. The countries with a larger population will have a more accurate estimate because a smaller percentage of the population is included in the sample.
O C. The countries with a smaller population will have a less accurate estimate because a larger percentage of the population is included in the sample.
D. The difference in population size has no effect whatever on the precision of estimates from these surveys. Only the sample size matters.
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