Researchers periodically survey a few thousand of the patients taking a certain medication in order to make connections between that medication and the subjects’ general health. This method of gathering data is classified as
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?
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?
Pollsters take a survey of people at a ball game to collect and analyze data about favorite leisure activities of Star City’s residents. Would this study be biased? Why or why not?
The population of a town is divided into three age categories. A random sample of each category is surveyed about voting choices. This type of sampling is called
A teacher asks students to list the math lessons they learned on nine random school days in the past month. She evaluates the students’ performance on this assignment to get a general picture of how well students are taking notes. This teacher’s method is an example of
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 sample used for the survey ?
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?
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
Which method of gathering data will be most effective in learning how diet and fitness choices affect long-term health?
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