7.1 Draw Scatter Plots & Best-Fitting Lines

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Presentation transcript:

7.1 Draw Scatter Plots & Best-Fitting Lines

Vocabulary Scatter plot: a graph of a set of data pairs (___, ___) Positive correlation: y tends to ________ as x ________ Negative correlation: y tends to ________ as x ________

More Vocabulary r x y x y x y x y x y -1 1 Correlation coefficient: (r), a number from ___ to ___ that measures how well a line fits a set of data pairs (x, y). x y x y x y x y x y r -1 1

If “r” is… -.956 .899 1 -1 0.5 -0.6

Mathematical Formula for Computing “r” Thank goodness your calc can do this!

More Vocabulary Best-fitting line: line that lies as close as possible to all the data points Linear regression: a method for finding the equation of the best-fitting line, or regression, which expresses the linear relationship between the independent variable x and the dependent variable, y, e.g. y = _________

Guided Practice for Ex.1, p. 248 1) 2)

Example 2: Approximate the best-fitting line Scatterplot Best-Fit Line EQ Best-Fit Line Graph See Handout

Start Homework See Agenda

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