Lesson 3

1. Lesson 3

1.2. Explore

Mathematics 30-3 Module 3

Module 3: Algebra

Explore

Before continuing, look over some definitions so you don’t find yourself lost in the terminology.

This photograph is of water spraying upward on a blue background.

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A scatterplot is a graph of ordered pairs, used to evaluate what type of relationship (if any) exists between two variables.1 As shown in the graphic, the spray of water droplets can serve as the display of points on a scatterplot.

This is a photograph of six penguins climbing a snow-covered hill single file in a straight line.

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A line of best fit is a line drawn on a scatterplot to show the general trend in the data.2 The penguins are travelling along a path that is close to linear, therefore, a line of best fit can be imagined.

This is a photograph of a rainbow over a green field with a blue sky in the background.

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Correlation is the degree of relatedness between variables.3 What is the relationship between the rainbow and the blue sky? What must have just happened in order for the rainbow to occur?

1–3 Source: MathWorks 12 Student Book/Teacher Guide. (Vancouver: Pacific Educational Press, 2011.)