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Back to Tutor Intake Assessment: Use data from a random sample to draw inferences about a population

7.SP.A.2 Tutor Intake -- Drawing Inferences from Random Samples

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Grade 7·8 problems·~11 min·Common Core Math - Grade 7·standard·7-sp-a-2
Work through problems with immediate feedback
A

Concepts

1

A school has 800 students. A random sample of 40 students finds
that 26 have a pet. Based on this sample, how many of the 800
students would you estimate have a pet?

2

A random sample of 200 registered voters finds that 130 prefer
Candidate A. Which statement correctly reports this result?

3

Two different classes each draw a random sample of 10 tiles from
the same bag of colored tiles. Class A finds 6 out of 10 red;
Class B finds 4 out of 10 red. What does this most likely show?

B

Procedures

1

Quality control randomly tests 100 widgets out of 10,000 produced
in a day and finds 4 are defective. Estimate how many of the
10,000 widgets are defective.

2

A researcher draws one random sample and estimates that 55% of a
population supports a new policy. What is the best way to get a
better sense of how reliable this single estimate is?

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