Random Samples to Describe Populations

•A pediatrician randomly selected 10 parents of his patients. Then he surveyed the parents about their opinions of different kinds of diapers. What is the population and sample?

• The population is the parents of the pediatrician's patients who wear diapers; the sample is the parents of all of the pediatrician's patients.

• The population is the pediatrician's patients; the sample is the 10 patients selected.

• The population is the parents of the pediatrician's patients; the sample is the 10 parents of patients selected.

The state Department of Transportation wants to know about out-of-state vehicles that pass over a toll bridge with several lanes. A camera installed over one lane of the bridge photographs the license plate of every tenth vehicle that passes through that lane.

• The population is all of the vehicles that pass over the toll bridge; the sample is vehicles from the lane with the camera.

• The population is all of the vehicles that pass through the lane with the camera; the sample is the group of every tenth vehicle that passes through the lane.

• The population is all of the out-of-state vehicles; the sample is the vehicles that pass over the toll bridge.

A group of librarians are interested in the numbers of books and other media that patrons check out from their library. They examine the checkout records of 150 randomly selected adult patrons.

• The population is all adult patrons of the library; the sample is the 150 patrons selected.

• The population is all patrons of the library; the sample is the adult patrons of the library.

• The population is all patrons who check out at least 1 book from the library; the sample is the 150 patrons selected.

A city council member wanted to know how her constituents felt about a planned rezoning. She randomly selected 75 names from the city phone directory and conducted a phone survey.

• The population is everyone listed in the city phone directory; the sample is the 75 people selected.

• The population is residents of the city; the sample is the registered voters in the city.

• The population is registered voters in the city; the sample is everyone listed in the city phone directory.

The owners of a sports stadium wanted to predict what additional refreshment options would sell well. They selected 80 seat numbers at random and surveyed the occupants of those seats.

• The population is all people who buy refreshments in the sports stadium; the sample is the occupants of the 80 selected seats.

• The population is the occupants of the 80 selected seats; the sample is the refreshment options.

• A.The population is the occupants of all seats in the sports stadium; the sample is the occupants of the 80 selected seats.

Administrators at Riverview High School surveyed a random sample of 100 of their seniors to see how seniors at the school felt about the lunch offering at the school's cafeteria.

• The population is all high school seniors in the world; the sample is all of the seniors at Riverview High.

• The population is all students at Riverview High; the sample is all of the seniors at Riverview High.

• The population is all seniors at Riverview High; the sample is the 100 seniors surveyed.