Discuss perfect correlation and negative correlation.
Use the following data to answer these questions regarding correlation:
The state of Vermont is divided into ten health planning districts, corresponding roughly to counties. The data for 2002 represent the percentage of newborns under 2500 grams (Y), the fertility rate for females <17 or >35 years of age (X1), and the percentage of births to unmarried mothers (X2) for each district:
|
District
|
Y
|
X1
|
X2
|
|
1
|
6.1
|
43.0
|
9.2
|
|
2
|
7.1
|
55.3
|
12.0
|
|
3
|
7.4
|
48.5
|
10.4
|
|
4
|
6.3
|
38.8
|
9.8
|
|
5
|
6.5
|
46.2
|
9.8
|
|
6
|
5.7
|
39.9
|
7.7
|
|
7
|
6.6
|
43.1
|
10.9
|
|
8
|
8.1
|
48.5
|
9.5
|
|
9
|
6.3
|
40.0
|
11.6
|
|
10
|
6.9
|
56.7
|
11.6
|
a. Make a scatter plot of Y and X1 using Word. To do this click on insert and then chart. Click on X Y (Scatter). Enter the data from the table.
b. Draw the line that appears to best fit the data.