Bias vs UnBias

To get valid results, a sample must be...

• biased

• unbiased

Which would be a good Unbiased group?

• every third student entering the building

• every member of the varsity football team

• every member in Ms. Zimmer’s drama classes

• every student having a second-period French class

A school newspaper will survey students about the quality of the school’s lunch program. Which method will create the least biased results?

• Twenty-five vegetarians are randomly surveyed.

• Twenty-five students are randomly chosen from each grade level.

• Students who dislike the school’s lunch program are chosen to complete the survey

• A booth is set up in the cafeteria for the students to voluntarily complete the survey.

A survey is being conducted to determine if a cable company should add another sports channel to their schedule. Which random survey would be the least biased?

• surveying 30 men at a gym

• surveying 45 people at a mall

• surveying 50 fans at a football game

• surveying 20 members of a high school soccer team

A survey is being conducted to determine which types of television programs people watch. Which survey and location combination would likely contain the most bias?

• surveying 10 people who work in a sporting goods store

• surveying the first 25 people who enter a grocery store

• randomly surveying 50 people during the day in a mall

• randomly surveying 75 people during the day in a clothing store

Erica is conducting a survey about the proposed increase in the sports budget in the Hometown School District. Which survey method would likely contain the most bias?

• Erica asks every third person entering the Hometown Grocery Store

• Erica asks every third person leaving the Hometown Shopping Mall this weekend.

• Erica asks every fifth student entering Hometown High School on Monday morning.

• Erica asks every fifth person leaving Saturday’s Hometown High School football game.

A survey is being conducted to determine which school board candidate would best serve the Yonkers community. Which group, when randomly surveyed, would likely produce the most bias?

• 15 employees of the Yonkers school district

• 25 people driving past Yonkers High School

• 75 people who enter a Yonkers grocery store

• 100 people who visit the local Yonkers shopping mall

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

• Biased
• Unbiased

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

• Biased
• Unbiased

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

• Biased
• Unbiased