C. A. Warm Up 1/28/15

Soccer Basketball TotalBoys 18 12Girls 16 14Total

Students were asked which sport they would play if they had to choose.

1) Fill in the marginal frequencies.

2) What percentage of students who would choose soccer are boys?

3) What percentage of students chose basketball?

4) What percentage of students who chose soccer where girls?

SID.6: SCATTER PLOTSJan. 28th, 2015

Vocabulary

• Scatter Plot – a graph that shows the relationship between two _______________ on the same _______.

• • Response Variable – variable whose value can be

explained by, or is determined by the value of the ___________ variable. Goes on the ____ axis

• • Predictor Variable – variable who value can influence

or determine the __________variable. Goes on the _____axis.

variablesplane

predictor y

responsex

Ex 1). Create a scatter plot from the table below.

Discussion: 1). What type of relationship seems to exist between study time and math SAT score?

Types of Relationships:Positive Negative

Strong Weak

Ex 3). Construct a scatter plot for the data below.

Describe the relationship illustrated

by the scatterplot.

Correlation – the measure of how well a

______________________fits a set of data. The

________________ coefficient is a value between ____ and ____

which indicates how close the data are to forming a straight line.

The _____________ the correlation coefficient is to 1 or -1, the

______________the linear relationship is between the two

variables.

Linear function

correlation -1 1

closer

stronger

Ex 1). Describe the relationship of the graph to the right. Guess it’s correlation coefficient.

Ex 2). Describe the relationship of the graph to the right. Guess it’s correlation coefficient.

Assignment: Complete the ½ Sheet Assignment: Scatter Plots

1/28/15