CP Algebra II 9/8/15
2.5 Line of Best Fit
1.
This table shows pizza prices as a function of the diameter.
a.
2.
Name:
Diameter (inches)
8
10
12
Price (dollars)
1.50
3.50
6.95
D
raw a SCATTERPLOT of these data. Describe the CORRELATION.
16
18
9.95
11.50
b.
Compute the coordinates of the CENTROID. Sketch in a LINE OF FIT to show how years
of experience are related to hourly rate of pay. Write an equation for your LINE OF FIT.
c.
Use your equation to predict the price of a 24-inch diameter pizza.
d.
Use the regression feature on your calculator to find the LINEAR REGRESSION
EQUATION and the CORRELATION COEFFICIENT How do your equations compare to
the regression equation?
e.
Use the linear regression equation to predict the price of a 24-inch diameter pizza.
As Joe drives into the mountains, his car thermometer registers these temperatures (in
altitudes (feet).
) at these
a. Make a SCATTERPLOT to show how temperature is related to altitude. Describe the
CORRELATION.
b. Compute the coordinates of the CENTROID. Sketch in a LINE OF FIT to show how temperature
is related to altitude. Write an equation for your LINE OF FIT.
c. Find the REGRESSION EQUATION and the CORRELATION COEFFICIENT.
d. Use your equation to predict the temperature for an altitude of 12000 feet.