Samples and Populations

_______ is a smaller part of a group being studied.

• Sample

• Population

• Random Sample

• Mean

_______ is the entire group being studied.

• Sample

• Population

• Random Sample

• Statistic

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

• True
• False

A city council member wanted to know how her constituents felt about a planned rezoning. She randomly selected 75 names from the city phone directory and conducted a phone survey.

• The population is everyone listed in the city phone directory; the sample is the 75 people selected.
• The population is residents of the city; the sample is the registered voters in the city.
• The population is registered voters in the city; the sample is everyone listed in the city phone directory.

A safety inspector conducts air quality tests on a randomly selected group of 7 classrooms at an elementary school.

• The population is all classrooms in the district; the sample is the 7 classrooms selected.
• The population is all classrooms in the elementary school; the sample is the 7 classrooms selected.
• The population is all elementary students in the school; the sample is the students in the 7 classrooms selected.

Ana wants to know the average student’s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?

• thirty students who are often tardy
• thirty students who are rarely tardy
• thirty of her friends
• thirty randomly selected students from her school

"𝟓𝟓% of the responders to a poll at a university indicated that wealth needed to be distributed more evenly among people." The sample is...

• All the university students

• the 55% of responders

• The responders to the poll.

Based on the data collected from all New York residents in 2010 by the U.S. Census Bureau, 84.6% of people living in New York had at least a high school education.

The population is...

• 84.6% of the people living in NY

• All the people living in NY

• All the people in the US

• All the people in the world ever.

To find out how students at AMS feel about their cafeteria food, we survey the students in Mr. Pearson's Math 7 class. The population is...

• The students in Mr. Pearson's Math 7 class

• All the students at AMS

• The cafeteria food

How well do you feel you understand the difference between a sample and population?

• My brain is lots more growing to do because I'm lost.

• With more practice, I'll get it

• It makes sense

• I totally rock this stuff.