7th Grade Statistics Review

A musician wanted to see what people who listened to his last album thought about the songs. Which choice is the best sample?

• Every person who listened to the album.

• A selection of people who didn't want to listen to the album.

• 250 girls who listened to the album.

• A random selection of 3,294 people who listened to the album.

A sample where characteristics accurately reflect those of the larger population from which the sample is being selected.

• Convenience Sample

• Random Sample

• Representative Sample

• Systematic Sample

The counselors at a camp are scheduling activities for family visitation day. They decide to conduct a survey to determine which activities campers would most like to share with their families.

Which describes a method for getting a sample that is both representative and random?

• During the dinner hour, announce that any camper interested in doing so can collect and complete a survey.

• During camp free time, ask every fifth camper in the arts and crafts hall to complete a survey.

• During morning roll call, ask every tenth camper to complete a survey.

• During camp free time, ask all campers down at the lake to complete a survey.

What is the difference between a sample and a population?

• Populations only consider a portion of the sample being studied.

• Samples only consider a portion of the population being studied.

• Populations do not always represent the entire group of people in question.

• Samples are generally much larger than populations.

What is the lower extreme of the data shown?

• 64

• 58

• 66

• 61

Which class has the higher test score median? 

• Class #1

• Class # 2 

• The medians are equal.

• The median is not shown here. 

Which best represents the Interquartile Range?

• 15

• 93

• 85

• 78

Find the Mean Absolute Deviation:  5, 11, 2, 7, 16.  The Mean is 8.2 

• 3.2

• 2.8

• 1.2

• 4.2

What is the range of the data?

• 6

• 34

• 38

• 88

Which group had the largest range and what is the range?

• male and 62

• male and 57

• female and 54

• female and 57