Unit 1: Sampling Methods Vocab.

4. A school separates students by grade level and randomly chooses 25 students from each grade to complete a survey.
5. At a football game, a student surveys every 10th person who enters the stadium.
7. A counselor puts every senior's name into a computer and uses a random number generator to choose 50 students.
8. A teacher wants student opinions about the pep rally, so she surveys the students sitting in her classroom during lunch.
9. A principal wants to know how students at Discovery High feel about the new lunch schedule. The group of all students at Discovery High is this.
11. A school posts a survey on its website, and students decide whether they want to complete it.
12. A student wants to know how much teenagers spend on food each week, so she creates a survey and collects responses from 100 students herself.

1. Researchers divide volunteers into two groups. One group drinks a caffeinated beverage before a test, while the other group drinks a caffeine-free beverage. Researchers compare their test scores afterward.
2. A principal randomly chooses five homeroom classes and surveys every student in those classes.
3. A survey about school lunches is given only to students who buy lunch from the cafeteria every day. This problem could cause the results to favor certain responses.
4. A student researching teen employment uses previously collected data from a government website instead of conducting her own survey.
6. To study student opinions about homework, a teacher surveys 75 students out of the 2,000 students at the school. The 75 students are this.
10. Researchers record how many hours students sleep each night and compare that information with their grades. They do not ask students to change their sleeping habits.