Word Problems and Scatterplots - TypePad

Scatter Plots

A scatter plot is a graph with points plotted to show a relationship between two sets of data.

Making a scatter plot of a data set:

A teacher surveyed her students about the amount of physical activity they get each week. She then had their body mass index (BMI) measured. Use her data to make a scatter plot.

Active Hrs

Student per week BMI

A

10

16

B

3

25

C

6

24

D

8

10

E

10

16

F

8

18

G

7

21

H

2

28

I

19

9

J

14

12

BMI

35 30 25 20 15 10

5

0

4

8

12

16 20 24

Hours

Correlation describes the relation between two sets of data.

Use the given data to make a scatter plot of the weight and height of each member of a basketbal team.

Height 71 68 70 73 74

Weight 170 160 175 180

190

weight (lb)

190 180 170 160

0 68 70 72 74 76 78 80

height (in)

strong

weak

Positive Correlation: both data sets increase together.

weak

strong

No Correlation: changes in one data set do not affect the other data set.

Negative Correlation: as one data set increases, the other decreases

Do the data sets have a positive, a negative, or no correlation?

Examples: 1. The age and weight of a baby As a baby gets older his weight ________. Both sets of data ________, so the data has a __________ correlation.

2. The amount of free time you have and the number of sports that you play Your free time _________ as the number of sports you play ________; therefore, the data has a ________ correlation.

3. The price of a shirt and the color of its buttons The price is not affected by the color of its buttons so the data has _________ correlation.

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