Quiz review: Sample and Bias

Dylan wants to know how the students at his school rate the cafeteria.  He surveyed his school's basketball team to rate the school cafeteria. Is this a biased sample of the school's population?

• Yes, because it is a convenience survey
• No, the basketball team has the smartest students
• Yes, because it's voluntary survey
• No, he should have asked the football team

Identify the Population:
Wicomico County Public Schools randomly selected 230 teachers to find out which technology resource it's teachers feel is the most effective.

• 230 Teachers
• All Wicomico County Teachers
• Students
• Wicomico County Public Schools

Identify the Sample:
A restaurant wants to know if their customers buy dessert when they eat out. As people leave the restaurant one evening, 20 people are surveyed at random. Eight people say they usually order dessert when they eat out. The restaurant concluded that most customers do not order dessert.

• 20 customers
• All customers
• 8 customers
• Dessert

What sampling method are you using if you survey every 5th person who enters the room.

• Convenience

• Systematic

• Simple Random

What sampling method are you using if you survey the students in the school whose names are picked out of a hat?

• Convenience

• Systematic

• Simple Random

A teacher splits her classes up by period. She then randomly picks 3 students from each period to do a survey.

• Stratified.

• Systematic

• Cluster

• Biased.

A teacher wants to know how well her students are doing on a topic. She randomly picks one class to survey.

• Simple Random

• Cluster

• Stratified

• Systematic

Units of the population are ordered in some fashion.  Usually, every k-th unit is chosen.

• proportional
• probable
• stratified
• systematic

Units of the population are grouped; one or more groups are selected at random.  All units of that group are included in the sample.

• cluster sample
• simple random
• stratified
• proportional

Identify the sampling design: SCPS wants to survey its employees.  They pick 4 schools from the county and survey every single employee in each of the 4 buildings.

• cluster
• volunteer
• systematic
• simple random