Sampling Methods, Studies and Bias

Each student at a school has a student identification number. Counselors have a computer generate 50 random identification numbers and those students are asked to take a survey. What type of sampling method is being used?

• Simple Random Sampling

• Stratified Random Sampling

• Cluster Random Sampling

• Systematic Random Sampling

A principal orders t-shirts and wants to check some of them to make sure they were printed properly. She randomly selects 2 of the 10 boxes of shirts and checks every shirt in those 2 boxes.

• Simple Random Sampling

• Stratified Random Sampling

• Cluster Random Sampling

• Systematic Random Sampling

A school chooses 3 randomly selected athletes from each of its sports teams to participate in a survey about athletics at the school. What type of sampling method is being used?

• Simple Random Sampling

• Stratified Random Sampling

• Cluster Random Sampling

• Systematic Random Sampling

While students are lined up for school pictures, a teacher passes out a survey to every 10th student. What type of sampling method is being used?

• Simple Random Sampling

• Stratified Random Sampling

• Cluster Random Sampling

• Systematic Random Sampling

Marianne wanted to know students' opinion on the new schedule at school. She places students' names in a container and randomly picks out 20 names. What type of sampling method is being used?

• Convenience Sampling

• Systematic Random Sampling

• Simple Random Sampling

• Volunteer response

Why do we randomly select our samples? (There is more than one correct answer)

• for fun

• reduce bias

• To ensure our sample represents our population

• make our study more reliable

• it's not really necessary

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.

She selects the five closest to her desk. What type of sampling method is being used?

• simple random

• Voluntary Response

• Convenience

• Systematic Random

Disneyland often surveys its guests as they exit a restaurant during their visit. The surveyor stands at the restaurant exit, counts the number of people leaving, and surveys every 25th guest.
This is a form of:

• Simple Random Sample
• Stratified Random Sample
• Voluntary Response
• Systematic Random Sampling

What type of sampling method is being used?

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.

She selects the first five who raise their hands.

• Systematic

• Convenience

• Volunteer Response

• Simple Random

Elise, a supermarket employee, approached 50 random customers and asked whether they would be willing to discuss what they like most about the store. She interviewed the 22 who said yes. Is this sample of the supermarket's customers likely to be biased? If "Yes" what type of bias is it?

• Not biased.

• Biased. Non-response bias.

• Biased. Measurement bias.

• Biased. Response bias.