Scatter plots, relationships, and Trend lines Objective: Learn to read and interpret scatter plots. Learn to draw trend lines.

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Scatter plots, relationships, and Trend lines Objective: Learn to read and interpret scatter plots. Learn to draw trend lines.

Scatter plots are used to investigate the relationship between two sets of numbers. A scatter plot with a POSITIVE RELATIONSHIP When 2 sets of data increase at the same time, the sets show aWhen 2 sets of data increase at the same time, the sets show a positive relationship. A scatter plot of a positive relationship slants upward to the right. A scatter plot with a NEGATIVE RELATIONSHIP When 1 set of data increases as the other decreases, the set shows a negative relationship. A scatter plot of a negative relationship slants downward to the right.

When 2 sets of data neither increase nor decrease together, they show no relationship When sets of data show a positive or negative relationship, you can draw a trend line to approximate the data. By extending the trend line you can make predictions about the future.

Homework: Scatter plots Determine whether each data set shows a positive, a negative, or no relationship.

Homework: If you haven’t brought your M&M bag (regular size), please bring it Monday/ Tuesday plus any materials you might want to use to decorate your project next week.