Populations and Sampling

The population describes:

• The entire group of people

• part of the group

• a section of the world

• part of the school

True or False: ALL samples lead to a good prediction about an entire population.

• True
• False

Mrs. Boyd wants to find the average height of all her students in her classes. She decides to use the first 5 people who walk in the door. Is this a good representative sample?

• Yes
• No

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

Biased sampling is

• when you choose a population that is more likely to give you the result you want
• when you choose a group that is equally likely to be chosen

Mr. Howard, the psychology teacher, invited his students stay after school to participate in a study on learning styles so that he could better understand how to teach them. 15 of his students participated. Is this sample of the teacher's students likely to be biased?

• Yes
• No

Bryce experimented with 7 exercises from each class offered at his gym. Each class has an equal number of exercises.
Is this sample of the exercises at the gym likely to be biased?

• Yes
• No

Devon polled 642 drivers late on a Friday night.
Is this a random sample of the drivers in the city?

• Yes because this represents all the drivers in the city well.
• No, because this only represents people late on a friday night

A survey should always be ____ and ____.

• random and biased
• random and unbiased

Tags

CCSS.RI.7.7

CCSS.RI.8.7

CCSS.RL.6.7

CCSS.RL.7.7

CCSS.RL.8.7

Cindy plans to survey the students at her school to see if they own pets. Which group should Cindy survey to get a representative sample of all the students at her school?    

• Students who have pets at home    
• Students who have been to a dog show    
• Students who eat lunch at the school cafeteria    
• Students who went to see a movie about animals