Scatter plots, Scatter plots, relationships, and Trend relationships, and Trend

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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 A scatter plot with a POSITIVE RELATIONSHIPPOSITIVE RELATIONSHIP

• When 2 sets of data When 2 sets of data increase at the same increase at the same time, the sets show a 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: Homework:

Scatter plotsDetermine whether each data set shows a positive, a negative, or no relationship.

Homework: 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.