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

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