DataGather

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

• biased

• unbiased

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

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

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.7.SP.A.1

CCSS.7.SP.A.2

Identify the Sample:
A restaurant wants to know if 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

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

A sample should be

• representative of  only middle school students only
• a very large group
• representative of the population
• representative of people who volunteer

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2