STAT 221 Quiz1Asolution.pdf - CS&SS/SOC/STAT 221 Quiz 1...

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CS&SS/SOC/STAT 221: Quiz 1 April 9, 2015 VERSION: A Question 1 (1pt) The Excite Poll is an online poll at poll.excite.com. You click on an answer to become part of the sample. One poll question was “Do you refer watching first-run movies at a movie theater, or waiting until they are available on home video or pay-per-view?” A total of 8896 people responded with 1118 saying they preferred theaters. From this survey you can conclude that A. Americans prefer watching movies at home. B. a larger sample is necessary. C. the poll uses voluntary response, so the results tell us little about the population of all adults. D. movie theaters should lower their prices.
Question 2 (1pt) At a large university a simple random sample of 5 female professors is selected and a simple random sample of 10 male professors is selected in order to study the population of professors at the university. The two samples are combined to give an overall sample of 15 professors. The overall sample is
Use the following to answer Questions 35. A political party sends a mail survey to 1500 randomly selected registered voters in a community. The survey asks respondents to give an opinion about the job performance of the current President. Of the 1500 surveys sent out, 480 are returned, and of these, only 120 say they’re satisfied with President Obama’s job performance.Question 3 (1pt) The population is

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