Scatterplots & Linear Regression

Scatterplots & Linear Regression

Scatterplots

* A graph of a set of data points (x,y)

* A way to determine if 2 variable are related to each other

*Example:

Open Ended

Give an example of when scatterplots would be useful outside of the classroom.

Multiple Choice

Does this scatterplot have a positive or negative correlation?

• Positive Correlation

• Negative Correlation

Multiple Choice

Which correlation coefficient best matches the given scatterplot?

• r = 0.8

• r = 0.08

• r = - 0.8

• r = - 0.08

Open Ended

Estimate the correlation coefficient of the given scatterplot.

Multiple Choice

Exit Ticket: What is the correlation coefficient and linear regression of the data set: (1,7) (2,4) (3,-1) (8,-9) (6,-3) (-1,10).

• r = .98 & y = 7.9x - 2.1

• r = .97 & y = 7.9x - 2.1

• r = .95 & y = 7.9x - 2.1

• r = .98 & y = -2.1x + 7.9

• r = .97 & y = -2.1x + 7.9