Major League Baseball wants to test players to see whether they are using performance-enhancing drugs. Officials select a team a random, and a drug-testing crew shows up unannounced to test all 40 players on the team.

1. What is the population they are studying?

1. What is their sample? What is the sample size?

1. What sampling method did they use?

1. Identify any problems with their sampling method and any potential sources of bias.