Chapter 7 Sampling Methods Test Review

____________ is a part of the population.

• population

• sample

• biased sample

• random sample

__________ are all members of a group

• sample

• biased sample

• convenience sample

• population

Everyone has an equal chance of getting chosen in the sample.

• random sample

• convenience sample

• biased sample

• population

Members of the population that are readily available are sampled

• random sample

• biased sample

• convenience sample

• population

A sample that does not fairly represent the population.

• random sample

• biased sample

• convenience sample

• population

Choose the letter of the sampling method that will better represent the population.  Explain.

Predicted Winner of the Poster Contest.

       

• Sally asked 50 random people picked by a computer.  65% love the 1^st poster

• Tom asked his friends.  35% love the 1^st poster.

Billy wanted to find out which quarters class the majority of the 7^th graders enjoyed the most.  He asked everybody at his lunch table. Is this sample biased? 

• Yes

• No

• Maybe

• I'm not sure

A random sample of 20 students found that 15 of the students had a cell phone.  How many of the 750 students at Excelsior would you predict have a cell phone? 

• 562.5 students

• 500 students

• 15 students

• 400 students

Tags

CCSS.7.SP.A.2

Choose the letter of the sampling method that will better represent the population. 

Predicted Winner in an Election for Mayor

            a.  Harris calls 100 randomly chosen voters.  54% plan to vote for Mayor Green.

            b.  Julia asks 70 people whom she knows.  45% plan to vote for Mayor Green.

• Julia asks 70 people whom she knows.  45% plan to vote for Mayor Green.

• Harris calls 100 randomly chosen voters.  54% plan to vote for Mayor Green.

Sonya wanted to see what 7^th grade’s favorite sport was at her school.  She asked the people on her swim team.  90% of them said swimming.  Is this a biased or unbiased question? 

• Biased

• Unbiased

• Both

• Neither