1. Bell Ringer #7 Evaluate (p/3t)/6 when p = 6 and t = 4 (2m 2 + 5) – (m + 1) when m = 3

2. Scatter Plots and Correlation Mr. Haupt

3. Scatterplots A graph that relates two groups of data. Plotted as ordered pairs. (x,y) Most of the time, they are in the first quadrant of a coordinate plane.

4. Example #1

5. Correlation When we compare two sets of data, there are three results. – Positive correlation – Negative correlation – No correlation

6. Positive Correlation Positive correlation is when both sets of data increase together. It does not mean that one thing causes the other, it just means that when one goes up, so does the other.

7. Example #2

8. Negative Correlation Negative correlation means that as one data set increases, the other one decreases. Again, it does not mean that one set of data causes the other one to increase/decrease.

9. Example #3

10. No Correlation Sometimes, data sets are not related at all. In this case we can say there is no correlation. These graphs look a mess.

11. Example #4 I woke up like this!

12. Trend Line To show correlation more clearly, we usually draw a trend line onto a scatter plot. A trend line, for the most part, splits the data, and it follows the trend that the points make. They help us to approximate the value of one set of data when given a value for the second.

13. Example #5

14. So…. Go ahead and make a scatter plot from the following data: Draw a trend line. Is there positive, negative, or no correlation? x1191013584 y97812371