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Scatterplots

Scatterplots. Key Definitions. Correlation : A measure of how closely the points on a scatterplot fit the line. Can be strong/weak, positive/negative. You are travelling at 100km/h. Time and Distance are the two variables. Distance travelled, d, depends on the time, t.

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Scatterplots

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  1. Scatterplots

  2. Key Definitions • Correlation: A measure of how closely the points on a scatterplot fit the line. Can be strong/weak, positive/negative. You are travelling at 100km/h. Time and Distance are the two variables. Distance travelled, d, depends on the time, t. In d = 100t, t is the independent variable and d is the dependent variable. Dependent is always plotted on the y axis and Independent on the x axis.

  3. Key Definitions • Data set is Continuous if a variable can be any real number. Ex. volume of water vs. time under the tap. • Data set is Discrete if a variable cannot be any real number. Ex. Footballs sold in NS during the month of May.

  4. Lines of Best Fit, Slope, Equations

  5. Application • Draw a line of best fit • Describe the relationship between volume of gasoline and amount paid • Is the data discrete or continuous? • Determine the equation of the line of best fit. What does the slope represent? • Using the equation, determine the cost of 10L of gas. Cost for 60L?

  6. Linear or Non Linear Data? • Line of Best fit vs. Curve of Best Fit

  7. Linear or Non-Linear Using Tables

  8. Practice • Page 379 • #1 – 4 • Page 380 • #3, 10, 15, 17

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