Descriptive Statistics

Lesson 15

Math

Unit 2

9th Grade

Lesson 15 of 22

Objective


Create scatterplots and identify function shapes in scatterplots.

Common Core Standards


Core Standards

  • HSS-ID.B.6 — Represent data on two quantitative variables on a scatter plot, and describe how the variables are related.

Foundational Standards

  • 8.SP.A.1

Criteria for Success


  1. Understand that scatterplots compare the relationship between two quantitative variables.
  2. Create scatterplots by identifying appropriate variables (and assignment of assumed dependent/independent) and appropriate scales. 
  3. Make observations about the clustering, outliers, and general shape of the collection of points on the scatterplot. 
  4. Identify the most appropriate function shape for the collection of points in a scatterplot. 
  5. Relate the shape of the graph and clustering to a positive association, negative association, or no association. 
  6. Make conjectures about the relationship between the two variables based on the visual appearance of the strength of association. 
  7. Distinguish between correlation and causation, describing that a strong association does not indicate that the independent variable causes the dependent variable. 
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Anchor Problems

25-30 minutes


Problem 1

Each point in the scatterplot below shows one individual’s height, in inches, and weight, in pounds. 

The range of the data presented is $${120 \leq y \leq 190}$$.
The domain of the data presented is $${63 \leq x \leq 72}$$.


Label the axes with the appropriate variables and units, and mark quantities on the axes in an appropriate scale. 

Guiding Questions

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Problem 2

Match the scatterplot with the description. Write a scenario for the scatterplot that does not have a description. 

Guiding Questions

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References

New Visions for Public Schools Connecting Representations - Connecting Situations to Scatter Plots

Connecting Representations - Connecting Situations to Scatter Plots is made available by New Visions for Public Schools under the CC BY-NC-SA 4.0 license. © 2017 New Visions for Public Schools. Accessed https://docs.google.com/document/d/1UtWBDN15MiFByupfQDic2AjRXoRKatFVUwDRfsbZgug/edit.

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


You plan to buy a bike helmet. Based on data presented in this lesson, will buying the most expensive bike helmet give you a helmet with the highest quality rating? Explain your answer.

References

EngageNY Mathematics Algebra I > Module 2 > Topic D > Lesson 12Exit Ticket #2 and including data from http://www.consumerreports.org/cro/bike-helmets.htm

Algebra I > Module 2 > Topic D > Lesson 12 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..

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.

  • This is a three-act task that you should consider including during the lesson: Tap into Teen Minds, “Candle’s Burning”
  • Incorporate problems with the identification of variables, scale, the shape of the function, and prediction of when the candle might burn out.
  • Make sure to have students identifying variables so they are prepared to talk about what their comparisons mean in later lessons.

Next

Calculate, with technology, the correlation coefficient for a data set. Explain why correlation does not determine causation.

Lesson 16
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Lesson Map

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

Topic A: Descriptive Statistics in Univariate Data

Topic B: Descriptive Statistics in Bivariate Data

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