Sampling to Draw Inferences About Populations

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

Out of a group of 30 volunteers, 11 people are chosen to participate in a survey about the number of phone calls they make each week. What is the sample in this situation?

• The 11 people selected to participate

• The 19 people not selected to participate

• The 30 volunteers

• The people conducting the survey

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

A newspaper randomly chooses 100 names from its subscriber list and then surveys those subscribers to find out if they read the sports section. This sample is ........

• unbiased

• biased

Identify the Population:
Wicomico County Public Schools randomly selected 230 teachers to find out which technology resource it's teachers feel is the most effective.

• 230 Teachers

• All Wicomico County Teachers

• Students

• Wicomico County Public Schools

A sample is a part of the whole population.

Which is bigger? (más grande?)

• Sample

• Population

What is the name for the smaller group?

• Population

• Percent

• Sample

• Mode

What is the name for the bigger group?

• Population

• Median

• Sample

• Decimal

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

Which is smaller? (más pequeño?)

• Sample

• Population