Question

which sample fairly represents the population? select two options.

• measuring the height of every fiftieth person on the school roster to determine the average height of the boys in the school
• calling every third person on the soccer teams roster to determine how many of the team members have completed their fundraising assignment
• observing every person walking down main street at 5 p.m. one evening to determine the percentage of people who wear glasses
• sending a confidential e - mail survey to every one - hundredth parent in the school district to determine the overall satisfaction of the residents of the town
• taking a poll in the lunch room (where all students currently have to eat lunch) to determine the number of students who want to be able to leave campus during lunch

Explanation:

1. For the soccer team option: The sample is every third person on the team roster, which is a systematic random sample of the entire soccer team population, so it fairly represents the team to check fundraising completion.
2. For the lunch room poll option: All students are required to eat in the lunch room, so the poll includes the entire student population relevant to the question of leaving campus for lunch, making it a fair representation.
3. The other options are biased: The first targets the whole school roster but only wants boys' heights, the third only samples people on Main Street at 5 p.m. (not the whole town), and the fourth samples school district parents but wants town resident satisfaction (parents don't represent all town residents).

Answer:

• calling every third person on the soccer team's roster to determine how many of the team members have completed their fundraising assignment
• taking a poll in the lunch room (where all students currently have to eat lunch) to determine the number of students who want to be able to leave campus during lunch