Q1) Traffic Safety: Here is a passage from a study published by the National Highway Traffic Safety Administration in 2007.

"The National Occupant Protection Use Survey (NOPUS) is the only probability-based survey of driver cell phone use in the United States. The survey observes usage as it actually occurs at a random selection of roadway sites, and so provides the best tracking of the extent to which people in this country are using cell phones while driving."

NOPUS observed 43,000 drivers in this study.

To identify the population and the sample for this study, label each item on the left with a term on the right. Note - any given term on the right may be used more than once or not at all.

Group of answer choices

Drivers in the United States(population , sample)

Drivers in the United States who use cell phones while driving (population , neither)

The 43,000 drivers observed in the study (sample, neither)

Q2) You successfully completed statistics, and the Math Department Chair recruited you to be a tutor. It's day one on the job, and your first pupil is correcting her mistakes on a recent statistics exam. She incorrectly listed the reasons that researchers use random sampling when conducting a survey.

She wants to know why researchers should use a random sample to conduct a survey. Check all that apply.

Group of answer choices

_ A random sample is likely to avoid bias.

_ In a random sample some members of the population are more likely to be selected than others.

_ Random samples provide consistency and systematically favor one choice over every other choice in each survey question.

_ Random sampling will provide a more representative sample of population.

_ Researchers can use a random sample to draw conclusions about the population.

Q3)Suppose that you want to estimate the proportion of students at your college that use the library.

Which sampling plan will produce the most reliable results?

Group of answer choices

_ Select 50 students at random from the college.

_ Select 100 students at random from students in the library.

_ Select 200 students at random from students who use the Tutoring Center.

_ Select 300 students who have checked out a book from the library.