Y2: Statistics Practice

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?

• yes

• no

Political webpages often allow readers to rate whether they strongly agree, agree, disagree, or strongly disagree with the President's decision on any given situation. This is a form of:

• Voluntary Response
• Convenience Sampling
• Simple Random Sampling
• Systematic Random Sampling

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

Assign each car in a dealership a number and then use a random-number table to select the cars to be inspected. 

• systematic
• random sample
• convenience
• volunteer response

Marianne wanted to know students' opinion on the new schedule at school. She places all students' names in a container and picks out 20 to survey. 

• Convenience Sampling
• Systematic Sampling
• Random Sampling
• Volunteer response

Why do we randomly select our samples?

• to increase bias
• to reduce bias
• so we don't get the same answers from everyone
• because it's easier

Leslie wants to find out what show students watch the most.  She surveyed the 9 youngest students in the elementary school.  Is this sample of the students in the school likely to be representative?

• yes
• no
• Mr. Shinn, I have no idea!

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.

• simple random

• Self Selected.

• Convenience

• Systematic Random

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

She picks the student in every 5th seat.

• Simple Random

• Systematic

• voluntary response

• convenience

A teacher hands out an index card and asks ALL of her students to write down the following information: age, height (in inches), and what grade they are in.

Which of the following best describes her method of data collection?

• Census

• Simple Random Sample

• Cluster Random Sample

• Stratified Random Sample