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Name:________________________Section:________________________STA 200 Lab 2Research reports, opinion poll results, government surveys, and other numerical presentations area staple of life presented to teach us, to sway us, and occasionally to trick us. A goal of this course is to give you the ability to understand the statistical issues in the speeches you hear, the newspaper or magazine articles you read, the televised reports you watch, and Web pages you visit. Gallup began doing scientific polling back in 1932 when he predicted the victory of his mother-in-law (which surprised everyone else). He founded his organization after that election and has been polling Americans ever since. The Gallup poll we are looking at today has been asked of Americans since 1936.Answer the following questions about the article http://www.gallup.com/poll/122744/Labor-Unions-Sharp-Slide-Public-Support.aspx.1) a. Who carried out the survey?b. What was the population? What in this article indicated this as the population of interest?c. How was the sample selected?d. How large was the sample?e. What was the response rate?f. How were the individuals contacted?g. When was the survey conducted?h. What were the exact questions asked?2. Carefully describe the parameter(s) of interest in the poll. (There may be more than one). 3. Did any of the questions above help you to identify a source of bias in the conclusions of the report? Explain.4. Do any of the questions above that were not addressed in the article give you concernabout other potential sources of bias in the conclusions of the report? Explain.5. Does the article present a margin of error that is associated with the poll? If so, what is that margin of error? Does it present the sample size?6. Using the shortcut method for calculating margin of error (p42 in book), calculate themargin of error if you had a sample and tell whether it increases or decreases:a. half as big as the sample used in this survey. b. twice as big as the sample used in this survey.7. What would happen to the margin of error if the confidence level for this survey was:a. 90%?b.


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UK STA 200 - STA 200 Lab2. Worksheet

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