Statistics

Lesson 1

Math

Unit 7

7th Grade

Lesson 1 of 9

Objective


Understand and identify populations and sample populations for statistical questions.

Common Core Standards


Core Standards

  • 7.SP.A.1 — Understand that statistics can be used to gain information about a population by examining a sample of the population; generalizations about a population from a sample are valid only if the sample is representative of that population. Understand that random sampling tends to produce representative samples and support valid inferences.

Foundational Standards

  • 6.SP.A.1
  • 6.SP.B.5

Criteria for Success


  1. Distinguish between a population and a sample population, and identify both for statistical questions. 
  2. Understand that a population characteristic is determined using data from the entire population, whereas a sample statistic is determined using data from a sample of the population. 
  3. Describe different ways that data can be collected to answer a statistical question.
  4. Understand why a sample of a population may be useful or necessary to answer a statistical question.

Tips for Teachers


In sixth grade, students studied statistical questions, understanding that statistical questions anticipate variety in the data. This is the first time students investigate the taking of a sample of a population in order to answer a statistical question. 

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Anchor Problems

25-30 minutes


Problem 1

Investigate the statistical question: 

On average, how many hours of sleep did the students in your class get last night? 

a.   What is the population for this question?

b.   How can you collect the data?

c.   A population characteristic is determined by using data from an entire population. Based on your data collection, will your answer to this question be a population characteristic? Why or why not?

Guiding Questions

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Student Response

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Problem 2

Investigate the statistical questions: 

Question 1: On average, how many hours of sleep did all of the students in your school get last night? 

Question 2: On average, how many hours of sleep did the residents of your city or town get last night? 

a.   What are the populations for each question?

b.   Will you collect data for the entire population or a sample of the population for each question? How will you collect the data?

c.   A sample statistic is determined by using data from a sample of a population. Based on your data collection, will your answers to these questions be sample statistics or population characteristics? Why?

Guiding Questions

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Student Response

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Problem 3

For each statistical question below:

  • Identify the population.
  • Describe a method you would use to collect a sample, or if you would use the entire population.

a.   How many movies do students in your class see in a month?

b.   What is the median price of a two-bedroom condo or house in your city or town?

c.   How many pets do people own in your neighborhood?

d.   What is the typical life span of a particular brand of flashlight battery?

Guiding Questions

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Student Response

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References

EngageNY Mathematics Grade 7 Mathematics > Module 5 > Topic C > Lesson 13Teacher Version: Exercise 1

Grade 7 Mathematics > Module 5 > Topic C > Lesson 13 of the New York State Common Core Mathematics Curriculum from EngageNY and Great Minds. © 2015 Great Minds. Licensed by EngageNY of the New York State Education Department under the CC BY-NC-SA 3.0 US license. Accessed Dec. 2, 2016, 5:15 p.m..

Modified by Fishtank Learning, Inc.

Problem Set

15-20 minutes


Give your students more opportunities to practice the skills in this lesson with a downloadable problem set aligned to the daily objective.

Target Task

5-10 minutes


Lin wants to know how many games teenagers in the United States have on their phones.

a.   What is the population for Lin’s question?

b.   Explain why collecting data for this population would be difficult.

c.   Give an example of a sample Lin could use to help her answer her question.

Student Response

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References

Open Up Resources Grade 7 Unit 8 Lesson 12 Teacher Version12.5 How Many Games?

Grade 7 Unit 8 Lesson 12 Teacher Version is made available by Open Up Resources under the CC BY 4.0 license. Copyright © 2017 Open Up Resources. Download for free at openupresources.org. Accessed March 29, 2018, 12:30 p.m..

Additional Practice


The following resources include problems and activities aligned to the objective of the lesson that can be used for additional practice or to create your own problem set.

Next

Describe sampling methods that result in representative samples.

Lesson 2
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Lesson Map

A7CB09C2-D12F-4F55-80DB-37298FF0A765

Topic A: Understanding Populations and Samples

Topic B: Using Sample Data to Draw Inferences About a Population

Topic C: Using Sample Data to Compare Two or More Populations

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