Scatter Plots Scatter Plot: A scatter plot shows the relationship between TWO data sets. This relationship is also called correlation. There are three types of correlation: –Positive Correlation –Negative Correlation –No Correlation

Positive Correlation The pattern of the dots slants UP and to the right. The two data sets INCREASE TOGETHER.

Negative Correlation The pattern of the dots slants DOWN and to the right. When one data set INCREASES, the other DECREASES.

No Correlation The dots are spread out. There is no pattern.

Examples: What type of relationship is shown by each scatter plot? PositiveNegativeNo Correlation

Determine whether a scatter plot of the data might show a positive, negative, or no correlation. 4) study time, higher grades 5) height, intelligence 6) shoe size, salary 7) age of car, value of car 8) miles per gallon, gas expense 9) education, salary Positive Negative No Correlation Positive Negative No Correlation

Determine whether a scatter plot of the data might show a positive, negative, or no correlation. 10) wrist circumference, appetite 11) Birth date, ring size 12) wind-chill, ice cream sales 13) age of tree, number of rings 14) amount of snowfall, shovel sales 15) hair length, hat size Positive No Correlation Positive Negative No Correlation

Making a Scatter Plot: 1)Decide which data you will put on the x axis and the y axis. 2)Look at the values for the data you will put on the x-axis. Decide what your scale will be. Label this. 3)Look at the values for the data you will put on the y-axis. Decide what your scale will be. Label this. 4)Plot your points.

Example: Length of Call (min) Cost of Call ($) 3$1.50 5$ $ $ $ $15.00