Quadratic modelling of Canada's Baby Boom

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(RTF (text), PDF)

 

Overview

In this lesson, students will learn about applications of the vertex form Accessible version of upcoming formula: [y equals a times (x minus h)squared plus k] - End of accessible version of formula[y = a(x – h)2 + k] of a quadratic equation. Students will extract data on births in Canada from Statistics Canada's E-STAT database and import them into a statistical software program. Within the software program, students will model a quadratic equation. By adjusting the values of the a, h, and k parameters to maximize the fit of the parabola to the Canadian Baby Boom data, students will gain a greater understanding of the purpose of the parameters in the vertex form of a quadratic equation.

Contributors: Manny Avila, Queen's University; Joel Yan and Jennifer Hall, Statistics Canada


Objectives


Suggested grade levels and subject areas

Grades 10 and 11
Mathematics


Duration

One to two 75 minute periods


Materials

Computers with Internet access and statistical software
Computer projector
E-STAT account
E-STAT instructions
Software instructions:

Student worksheet
Student worksheet – Teacher version


Prior knowledge

Vertex form of quadratic equation Accessible version of upcoming formula: [y equals a times (x minus h)squared plus k] - End of accessible version of formula[y = a(x – h)2 + k]
Basic knowledge of E-STAT and statistical software


Classroom instructions

  1. Discuss important properties of the vertex form of the quadratic equation as a review.
  2. Using the computer projector, demonstrate the important features of E-STAT.
  3. Hold a brief class discussion on the topic of the Baby Boom to assess students' prior knowledge and share information on the topic.
  4. Distribute the student instructions and worksheet and have students complete the lesson independently or in pairs.

Enrichment

Have students repeat this process for a later time period to see if there is a significant Baby Boom Echo. Ask them to compare the shapes of the two curves, find the peak year of the Baby Boom Echo, find the period between the two peaks, and interpret this period of time.

Have students repeat this process for their province or territory instead of Canada as a whole. Ask them to compare the shapes of the graphs. If the shape of the graph for the province or territory is different from the shape of the graph of Canada as a whole, ask students to research reasons for this difference.

Have students import the data for the Baby Boom and the Baby Boom Echo into a graphing calculator or spreadsheet software to perform quadratic regression analysis. Have the students compare their curve of best fit for the data with the regression analysis.

Challenge your students to search on the E-STAT CANSIM database to find other time series data (among millions of time series) that can be modelled by a quadratic function. They can import these data into a statistical software program and attempt to plot quadratic functions to fit the data.

If students find an E-STAT time series that can be modelled well by a quadratic function, please e-mail us.


Evaluation

Students can be informally assessed on their work habits and computer skills throughout this activity. They can be formally assessed via the worksheet, which can be marked using a marking scheme of the teacher's choice.



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