Biased vs Unbiased

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

• Biased
• Unbiased

2.  A homeowner divides their backyard into 5 sections, and randomly removes soil from sections.

• Biased
• Unbiased

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

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

• Biased

• Unbiased

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

What type of survey sample is it when one portion of the population is favored over another?

• Unbiased sample

• Biased sample

Should more money be put into athletic programs or music programs at school?  Ask:  students in the band program.

• Biased 
• Unbiased

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

What is your favorite sport?  Ask:  people attending a soccer game

• Biased
• Unbiased

A company makes DVDs and randomly selects 25 from 1500 to test them to see if they work.

• Biased
• Unbiased

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

Unbiased sampling is:

• when you choose the group you think will represent the sample

• when any member of the population is equally likely to be chosen for the sample

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

CCSS.HSS.IC.B.5

At a middle school, the 7th graders will conduct a survey to decide where they want to go on a field trip. Which method will result in the least biased decision?

• to randomly ask 8th grade students who went on a field trip last year

• to randomly choose some 7th grade students to select a location

• to ask all 7th grade teachers and administrators for a location

• to ask the student council to choose a location