1. Scatter Plots That was easy Year # of Applications 1991 297 1993 331
1995
409
1996
482
1999
647
2000
615
The accompanying table shows the number of applications for admissions that a college received for certain years. Create a scatter plot that models this data.
College Applications
700
600
500
400
300
200
100
# of Applications
That was easy
Year

2. Scatter Plots on a Graphing Calculator
Year
# of
Applications
1991
297
1993
331
1995
409
1996
482
1999
647
2000
615
Lets take another look at that chart.
Let x = 1 represent 1991, x = 3 represent 1993 and so on so that x = 10 represents 2000.
Store the data
Press
STAT
ENTER
Enter x values in L1 and corresponding y values in L2.
Set up the Scatter Plot
Press
2nd
STAT PLOT
ENTER
ENTER
Display the Scatter Plot
Or press
GRAPH
Press
ZOOM 9
That was easy

3. Comparing Correlation Coefficients and Trends in Scatter Plots
As x increases, y increases. The closer r is to 1, the better a line fits the data and the stronger the linear relationship is.
As x increases, y decreases. The closer r is to -1, the better a line fits the data and the stronger the linear relationship is.
There is no significant linear relationship between x and y. The closer r is to 0, the weaker the linear relationship is.
Positive
Correlation No
Correlation
Negative
Correlation

4. Another Scatter Plot
Make a scatter plot using the given data and describe the relationship.
Altitude and Temperature 60 50 40 30 20 10
Temperature
The data has a negative correlation.
Altitude

5. Draw scatter plots and describe the relationship
Homework
Page 341: 7 – 10
Draw scatter plots and describe the relationship