Bias vs unbias

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

• biased

• unbiased

Convenience sample and voluntary response sample are types of...

• biased samples

• unbiased samples

To determine if my students like Math, I surveyed every 3rd student that walked into my classroom. This is an example of a ...

• simple random sample

• systematic random sample

• convenience sample

• voluntary response sample

To determine how many students at Shull would attend the dance, the principal surveyed the students in Ms. Miller's math class. 10 students said they would attend and 15 said they would not attend. It can be concluded that half the students at Shull will attend the dance. Is this conclusion valid? Why or why not?

• Yes, this is a simple random sample. So the sample is unbiased.

• No, this is a convenience sample. So the sample is unbiased.

• No, this is a voluntary response sample. So the sample is biased.

• No, this is a convenience sample. So the sample is biased.

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.A.2

CCSS.HSS.IC.B.3

The Student Council asked every tenth student in the lunch line how they preferred to be contacted with school news. The results are shown in the table. Is this an unbiased sample? If yes, suppose there are 684 students at the school. How many can be expected to prefer E-mail?

• No, it's a biased sample

• 432

• 304

• 16

You are doing a survey to find out what kids really think about school lunch and you stand outside a lunchroom and ask every 5th person from every grade.

• Biased (Unfair)

• Unbiased (Fair)

Erick wants to know how many hours of sleep college students get, so he surveys the 12 students in the front row of his college English class.

• Biased

• Unbiased

Ms. Rolf wants to know the average number of siblings her students have, so she assigns each of her students a number 1-72 and uses a random number generator to survey 12 students.

• 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

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4

Marcos wants to find out how many students at his school like to go to the movies. Which survey method is likely to produce a representative survey?

• Ask the boys in the boys locker room.
• Ask the 25 students in his homeroom class.
• Ask students coming out of a movie theater.
• Ask half of the 34 students on the soccer team.

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3