Samples and surveys

Greg divides his baseball cards by team. Then he randomly selects four cards from each team and records the players RBI's.

• simple

• self-selected

• systematic

• convenience

• stratified

The service manager at a car dealership inspects every fifth car to make sure that cars are detailed after being serviced.

• simple

• systematic

• self-selected

• convenience

• stratified

The students who attended a prom committee meeting were each given a raffle ticket for a drawing of five prizes.

• simple

• systematic

• self-selected

• convenience

• stratified

A music store asks its customers to submit suggestions for local bands that should play on Friday nights.

• simple

• systematic

• self-selected

• convenience

• stratified

A random sample of 10 people is asked to name their favorite actor.

• biased

• unbiased

Every fifth athlete at a basketball camp is asked to name their favorite brand of basketball shoe.

• biased

• unbiased

Every tenth person entering a gas station is asked to name their favorite television program.

• biased

• unbiased

Every fifth person entering a play is asked to name their favorite style of music.

• biased

• unbiased

James is throwing a party for one of his friends. He is trying to decide on a theme. He sends a piece of paper in each invitation, asking guests questions to get their opinions.

• survey

• observational study

• experiment

Carlos finds 50 students, half of whom volunteer at a homeless shelter, and compares their grade point averages, extracurricular activities, and involvement in school clubs.

• survey

• observational study

• experiment