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Example 1: page 161 #5

Example 2: page 160 #1 Explanatory Variable - Response Variable - independent variable dependent variable

Correlation coefficient - r Measures the strength and direction of the linear relationship between quantitative variables. Strength + r = positive correlation - r = negative correlation Direction strong moderate weak

Recipe for r There is a _(strength)___, ___(direction)____, linear relationship between __(explanatory)__ and __(response)__. Let’s use the formula to find r. This will be the only time we do it by hand. After today we will find it using on the calculator.

Posted speed limit (mph)Ave. # of weekly reported accidents 5528 5025 4521 4017 3011 256

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