Scatter Plots and Best- Fitting Lines By Tristen Billerbeck.

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Presentation transcript:

Scatter Plots and Best- Fitting Lines By Tristen Billerbeck

Correlations Positive Correlation---if the graph rises (y increases as x increases)

Correlations Negative Correlation---the graph falls (as y increases, x decreases)

Correlations No Correlation

Describe Which Scatter Plot Positive Correlation

Describe Which Scatter Plot No Correlation

Describe Which Scatter Plot Negative Correlation

Correlation Coefficients A correlation coefficient, denoted by r, is a number from - -1 to 1 that measures how well a line fits a set of data pairs (x, y). If r is near 1, the points lie close to a line with a positive slope. If r is near -1, the points lie close to a line with a negative slope. If r is 0, the points do not lie close to any line

What is the approximate correlation coefficient? Correlation coefficient is about 1.

What is the approximate correlation coefficient? Correlation coefficient is about 0.

What is the approximate correlation coefficient? The correlation coefficient is about -0.8.

Graphing Calculator Activity P. 97 P. 112

Key Strategy Draw the scatter plot Sketch the line that follows the trend Choose 2 points on the line and estimate the coordinates Write an equation of the line that passes through the 2 points.

Independent Practice

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