1. Scatterplots October 14, 2014

2. Warm-Up Given the following domain and range in set notation, write the equivalent domain and range in algebraic notation and interval notation. { x | x > -2 } { y | y < 8 }

3. Essential Question How does the line of best fit and correlation coefficient help to describe the data in a scatterplot?

4. Definitions scatterplot: a graph of coordinates that will show either positive, negative, or no correlation correlation: a measure of the strength and direction of the relationship between variables in a data set

5. Positive Correlation Negative Correlation No Correlation

6. line of best fit: the line that comes closest to all of the points in a data set line of best fit

7. Correlation coefficient (r): a measure of the strength and direction of the relationship between two variables or data sets -1 ≤ r ≤ 1 Strong Negative Correlation Weak Correlation Strong Positive Correlation 01

8. Calculator Example (1/2 sheet)

9. Reflection How do you tell from the correlation coefficient how strong the correlation is in a set of data?