Algebra Final Review #2

Which of the following is an example of a random sampling method?

• Surveying only your friends about their favorite school subject

• Selecting every 10th student from a list of all students in the school

• Asking students in the cafeteria during lunch

• Surveying only students in your math class

A researcher wants to study the average height of 9th graders in a school. Which of the following could introduce bias into the sample?

• Randomly selecting students from the entire 9th grade

• Measuring only the students on the basketball team

• Using a computer to randomly select students

• Drawing names from a hat containing all 9th graders' names

• The region above both lines

• The region below both lines

• The region between the two lines

• The region to the left of both lines

Which of the following is a characteristic of a well-designed experiment?

• Using a small, non-random sample

• Clearly defining variables and using random assignment

• Only collecting data from volunteers

• Ignoring possible sources of bias

A survey asks, "Do you agree that our school lunch is the best in the district?" Is the question biased or unbiased question?

• biased

• unbiased

A surveyor divides a state in 10 regions and randomly selects 100 residents from each region to survey. What kind of sample does this describe?

• Stratified Random Sample

• Simple Random Sample

• Systematic Random Sample

• Convenience Sample

Which of the following best helps reduce bias in a survey?

• Surveying only people who are easy to reach

• Using a random sample of the population

• Asking only people who volunteer

• Surveying only people who agree with your opinion