Sample Vs. Population

1. A sample in which every person, object, or event has an equal chance of being selected.

• A. Random sample.
• B. Biased sample.

2. When a sample does not accurately represent the population it is a:

• A. Unbiased sample
• B. Biased sample

3. A public library asked every 10th person who entered to name the type of book they were getting.

• A. Biased
• B. Unbiased

4.  Carlos wants to know the favorite sport of people at his school so he asks his baseball team.

• A. Biased
• B. Unbiased

5.  A hospital wants to open a gym. They ask the night-shift ER staff when they would use the gym.

• Biased
• Unbiased

6. Ana wants to know the average student’s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?

• A. Thirty randomly selected students from her school
• B. Thirty students who are rarely tardy
• thirty of her friends

7. The choir director in a high school wants to know how the students in the school feel about singing. If the director selects 100 girls and 100 boys to complete a survey, which method will result in a biased sample?

• A. The students will be selected from the choir.
• B. The students will be selected randomly throughout the school.

8. At a middle school, the 7th graders will conduct a survey for where to go on a field trip.
Which method will result in the least biased decision?

• A. To randomly ask 8th grade students who went on a field trip last year.
• B. To randomly choose some 7th grade students to select a location.

9. Mrs. Croix is conducting a survey to find out the favorite snack of fifth and sixth graders. She will ask a sample of 100 students. Which of the groups below should be surveyed to get the BEST representative sample?

• A. 20 students from each of the 5 local fifth- and sixth-grade schools.
• B. The first 100 students who go to a local baseball game

10. A teacher decides to survey the students in her classes to find out their opinion on the new menu in the cafeteria.  Is this biased or unbiased?

• Biased
• Unbiased