Populations and Samples

A school principal wants to see which subject the 526 in his school liked best. Which choice BEST represents a sample?

• All the students in the school

• The students in 3rd grade

• The first 90 students who come into the school

• The students making a B in math

Before a nation wide election, a polling place was trying to see who would win. Which choice BEST represents a sample?

• All voters

• A selection of male voters

• A selection of votes from one part of the nation

• A selection of voters from all over the nation

A mayor wanted to see if the people in his town thought he was doing a good job.

Which choice BEST represents a sample?

• The residents of the town

• The people who voted for the mayor

• 1000 unemployed voters

• The residents of 6 different neighborhoods

A toy store owner tracking how much kids spend each month on toys. Which choice BEST represents a sample?

• 257 boys age 7 - 15

• All of the kids who buy toys

• 277 rich kids

• 206 kids from age 10 to 15

If the population is ALL 7th Graders

Then you want to take a sample from ALL 7th graders.

A sample is part of the population but not all of it.

Select the one below that is true

• A sample is a smaller group selected from the population

• A sample is the entire population

• A sample is a larger group than the population

• A representative sample is not related to the population

The Magic Kingdom theme park has many attractions, one of which is Space Mountain. Are the people who ride Space Mountain the population or a sample of the theme park? Explain.

• Population. They are all the people at the theme park.

• Sample. They are a subset of all the people at the theme park.

• Both population and sample. They are all the people at the theme park

• Neither population nor sample. They are not the people at the theme park.

A toy store owner is tracking how much kids spend each month on toys. Which choice BEST represents a sample?

• All of the kids who buy toys.

• 275 rich kids

• 200 random kids of all ages

• 292 boys ages 7-15

You want to estimate the number of 7th grade students that walk home right after school. Which sample is unbiased?

• Three 7th grade students randomly selected in the hallway before homeroom

• 7th grade members of the Science Olympiad team

• Every fifth 7th grader walking down the sidewalk after school

• Every fifth student from an alphabetical list of the 7th grade

Which of the following is a random sample?

• Asking people attending a football game what their favorite sport is

• Asking people standing in line to buy a PS5 whether they prefer XBOX or Playstate

• Asking the band students at a school if more money should be spent on athletics

• Asking every 3rd student to walk in the building what their favorite breakfast is

As part of a 7th grade statistics project, the teacher brings a candy jar full of gumballs (red & green). The assignment is to estimate the proportion of red gumballs in the jar. Suppose one of the students draws 25 gumballs from the jar: 8 are red, 17 are green. What is the SAMPLE?

• 25 gumballs drawn

• all gumballs in the jar

• the students

• the 17 green gumballs