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Introducing Scatter Plots

Introducing Scatter Plots. New Terms . Scatter Plot : a graph that shows the relationship between two sets of numeric data Dependent variable : a variable that changes by some other variable Independent variable : a variable that affects the value of another variable

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Introducing Scatter Plots

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  1. Introducing Scatter Plots

  2. New Terms • Scatter Plot: a graph that shows the relationship between two sets of numeric data • Dependent variable: a variable that changes by some other variable • Independent variable: a variable that affects the value of another variable • Outlier: a point that differs significantly from the rest of the data on a graph

  3. Scatter Plots • To create a scatter plot: • Collect the data and organize it in a table or as ordered pairs • Present the data points on a graph with labelled axes

  4. Scatter Plots • Helps to see relationships between variables • The points in a scatter plot often show a general pattern, or trend. From the pattern or trend, you can describe a relationship, if one exists.

  5. Scatter Plots • A scatter plot of the relationship between two variable shows: • Positive correlation: when the pattern slants up and to the right. The two quantities increase together.

  6. Scatter Plots • Negative correlation: when the pattern slants down and to the right. As one quantity increases, the other decreases.

  7. Scatter Plots • No correlation: when no pattern appears.

  8. Scatter Plots • If the points nearly form a line, then the correlation is strong. • If the points are dispersed more widely, but still form a rough line, then the correlation is weak.

  9. Interpolate • Estimating a value within the range of values of the independent variable is called interpolating. • What number of ice-cream cones are sold when the temperature is 25oC?

  10. Extrapolate • Estimating a value that falls outside of the range of recorded set of data is called extrapolating. • What number of ice-cream cones are sold when the temperature is 32oC?

  11. Homework • Page 64: Q# 1-10 • Page 73: Q# 1-9

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