Biased and Unbiased Samples

You are doing a survey to find out if Knoxville, TN should be the home of a new NBA team and they only asked UT college boys basketball players.

• Biased (unfair)

• Unbiased (fair)

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

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)

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A teacher selects 30 students out of 300 students in grade 6, to participate in a survey about recycling. She asks first 30 students that enters her classroom. Of the 30 students, 25 students refills their water bottles. How many students will refill the bottle?

• 250

• 350

• 500

• 450

Tags

CCSS.7.SP.A.2

The last 20 people that were leaving a mall on a single day were asked about their favorite hobbies.

In total, 1000 people entered the mall. 17 people said they like shopping.

From the sample, how many people can we predict would also like shopping.

• 85

• 50

• 850

• 120

Tags

CCSS.7.SP.A.2

You are doing a survey to find out what sport high schoolers like the most, and you only ask people from a Rugby team.

• Biased

• Unbiased

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Someone is conducting a survey and asks this question. What is your favorite soft drink? Sample is chosen by picking names out of a telephone book.

• Biased

• Unbiased

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

The local gym is deciding if customers want more gym classes. The gym surveys 50 gym customers a day. How could the gym improve their sampling method?

• Ask 60 customers

• Go to mall and ask 50 people

• Ask every $5^{th}$ person that arrives to the gym

• Ask the first 5 customers

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

You are conducting a survey and ask people the following question: Should more money be put into athletic programs or music programs at school? Sample is chosen from students in the band program.

• Biased (Unfair)

• Unbiased (Fair)

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

You want to know your town’s favorite fast-food restaurant. You randomly ask 30 people their preference as they leave a McDonald’s restaurant.

• Biased

• Unbiased

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Which sampling method will give the most unbiased results, if you wanted to find the number of people in your school that spent more than 4 hours completing their homework.

• Ask 30 students in Math and science class

• Ask 30 people that you meet at the mal

• Ask 30 random students from your school of different ages

• Ask 30 friends

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1