Census and Sampling Data

When one examines the entire population instead of a subgroup of the population, this is called a ____________.

• Sampling

• Census

• Bias

Identify the Population: Cherokee County Schools randomly selected 230 teachers to find out which technology resource its teachers feel is the most effective. What is the population in this situation?

• 230 Teachers

• All Cherokee County teachers

• All Cedar Bluff teachers

• All Sand Rock and Spring Garden students

Identify the Sample: The Huddle House wants to know if their customers buy dessert when they eat out. As people leave the restaurant one evening, 20 people are surveyed at random. Eight people say they usually order dessert when they eat out. The manager at Huddle House concluded that most customers do not order dessert. What is the SAMPLE in this scenario?

• 20 customers from Huddle House

• All customers from Huddle House that evening

• 8 customers from Huddle House

• The employees from Huddle House

At Centre Middle School, the 7th graders will conduct a survey to decide where they want to go on a field trip. Which method will result in the least biased decision?

• to randomly ask 8th grade students who went on a field trip last year

• to randomly choose some 7th grade students to select a location

• to ask all 7th grade teachers and administrators for a location

• to ask the Beta Club to choose a location

7.SP.1

• A

• B

• C

• D

If I wanted to know how many blades of grass are inside the track, which sampling method could I use?

• Have my students count every blade of grass

• Guess

• Divide the grassy area into 1 inch sections, randomly pick several sections to count, average them together and multiply that by the total square inches.

Identify the population and sample for each example.

• Population: Students

  Sample: Members of the football team

• Population: Members of the football team

  Sample: Students

• Population: Students

  Sample: Students that have had a broken bone

• Population: Members of the football team

  Sample: Members of the football team that have broken a bone.

Mrs. Cathy wants to know how many students at Cedar Bluff enjoy solving math word problems. What is the best sampling method?

• ask for 20 volunteers to discuss whether they enjoy solving math word problems

• ask the last 20 people to arrive at CB this morning

• Randomly ask 2 students in the hallway by Mr. B's room

• Ask every 20th student that walks into school

At a middle school, the 7th graders will conduct a survey to decide where they want to go on a field trip. Which method will result in the least biased decision?

• to randomly ask 8th grade students who went on a field trip last year

• to randomly choose some 7th grade students to select a location

• to ask all 7th grade teachers and administrators for a location

• to ask the student council to choose a location

A high school has 1500 students.  In a random sample of 50 students, 32 own one or more pets.  Predict the number of students at the high school who own one or more pets.

• 480

• 960

• 48

• 96