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Back to Tutor Intake Assessment: Understand that statistics can be used to gain information about a population by examining a sample

7.SP.A.1 Tutor Intake -- Understanding Statistics and Sampling

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without a calculator. If you're unsure, give your best try — the goal is
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Grade 7·9 problems·~12 min·Common Core Math - Grade 7·standard·7-sp-a-1
Work through problems with immediate feedback
A

Concepts

1

A school principal wants to know how students feel about the
cafeteria menu. She surveys 40 randomly chosen students out of the
school's 800 students. What is the population in this situation?

2

A factory checks 100 lightbulbs from today's production run to
estimate how many of all the lightbulbs made today are defective.
Which statement correctly identifies the sample?

3

Which of these is the best reason statisticians usually study a
sample instead of an entire population?

4

What does it mean for a sample to be "representative" of its
population?

B

Procedures

1

Which of these best describes what "random sampling" means in
statistics?

2

A researcher wants to learn about the reading habits of all adults
in a city. She stands outside a bookstore and surveys the first 50
people who walk out. Is this sampling method likely to produce a
biased or a representative sample?

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