designing a study – Flashcards
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A company wants to learn about the number of its employees who visit the dentist for regular checkups. Which type of study will best help the company discover this information?
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census
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Which method of gathering data will be most effective in learning how diet and fitness choices affect long-term health?
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an observational study
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A market research company wants to collect opinions on the comfort and performance of a new type of sneaker by Brand X. Which group of individuals would be the best choice for a random sample?
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ask every fourth person who is wearing that brand of sneaker
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At the beginning of a call to the cable company, a message tells customers, "After you finish talking to our customer service representative, you will be asked to take a five-question survey about the level of service you received. It would be appreciated if you could please stay on the line to answer the survey questions." What type of sampling is the cable company using?
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voluntary sampling
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Which of the following could be classified as a census?
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a survey of each student in a school about school lunch options
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Researchers call random radio listeners on the phone to rank five different popular songs. This research helps radio stations decide which songs to play more often. This method of gathering data is classified as
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a sample survey.
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Political pollsters now make sure to conduct a percentage of their telephone interviews by calling mobile phones. This policy best addresses which potential source of bias?
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lack of access
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A professor surveys his students about their opinions on how well he taught the course. He puts this survey on the last page of his final exam. Which type of bias will most likely have the strongest effect on the survey results?
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response bias
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Brand Y Cola sponsors a survey of 15,559 residents of Texas to determine which brand of cola they prefer. Forty percent say they prefer Brand X, and 60 percent say they prefer Brand Y. Which of the following is the population sample?
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the 15,559 residents
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News cameras take an overhead picture of a part of a crowd at an outdoor event. Journalists then count the number of people in the picture and use the sample to estimate the total number of people in the crowd. This process is an example of
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cluster sampling.
