Question

which example 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:

• Measuring every fiftieth person on the school roster: This is a systematic sample. If the school roster is a comprehensive list of all students (assuming the population is the students in the school), and we are sampling in a systematic way, it can represent the population (for the characteristic of boys' height if we consider the selection within the context of the school population).
• Taking a poll in the lunch - room (where all students have to eat lunch): Since all students are required to be in the lunch - room, taking a poll there is equivalent to surveying the entire population of students (for the question of students' desire to leave campus during lunch).

• Calling every third person on the soccer - team's roster: The population here is likely the entire school or town, not just the soccer - team. So this sample only represents the soccer - team.
• Observing every person walking down Main Street at 5 p.m.: The population is not well - defined. People walking down Main Street at a particular time may not represent the general population (e.g., people who are at home, at work in non - Main Street locations etc. are excluded).
• Sending an e - mail survey to every one - hundredth parent in the school district: Parents in a school district may not represent the residents of the town (e.g., there may be residents without children in the school district).

Answer:

measuring the height of every fiftieth person on the school roster to determine the average height of the boys in the school; 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