Random Sampling and Representative Samples

You want to estimate the number of students in a high school who ride the school bus. Which sample is best?

• 4 students in the hallway

• All students in the marching band

• 50 seniors at random

• 100 students at random during lunch

Choose the best sample.

• Sample A

• Sample B

Choose the best sample.

• Sample A

• Sample B

The manager of the zoo would like to survey its visitors to determine their favorite exhibit. Which sample below would be unbiased?

• 20 random people in the food court

• Every 10th person who enters the zoo

• 50 random people at the tiger exhibit

• 3 people who are buying souvenirs

Are all quarters in circulation the sample or the population?

• Sample

• Population

If there are 1,000 students in your high school and 40 out of 80 students surveyed said they had a part-time job, how many out the 1,000 students would you predict to have a part-time job?

• 400

• 80

• 40

• 500

Leslie surveyed the 9 youngest students in the elementary school. Is this sample of the students in the school likely to be representative of all the students in the school?

• yes

• no

Aaliyah 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?

• thirty students who are often tardy

• thirty students who are rarely tardy

• thirty of her friends

• thirty randomly selected students at school

• A
• B
• C
• D

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?

• thirty students who are often tardy

• thirty students who are rarely tardy

• thirty of her friends

• thirty randomly selected students from her school