Exponential Regression

Copy the table below your notebook and then graph the points

Week Weight

0 50

1 38

2 30

3 25

4 22

5 20

-3 -2 -1 1 2 3 4 5 6 7 8 9

10

20

30

40

50

Days

weight in grams

Find an exponential function to fit the data.

Week Weight

0 50

1 38

2 30

3 25

4 22

5 20

38÷50=0.76

30÷38=0.789

25÷30=0.833

etc

Exponential Regression

• The relation between  values of x and values of y, from which the value of y can be predicted for any value of x.

Entering data into your TI 84

CLEAR!

ENTER!

Step 1. Enter the data in the calculator lists. Place the data in L1 and L2. STAT, #1Edit, type values into the lists

Step 2. Prepare a scatter plot of the data. Set up for the scatterplot. 2nd StatPlot - the first icon Choose ZOOM #9 ZoomStat.

Step 3. Have the calculator determine the line of best fit.STAT → CALC #4 LinReg(ax+b) Include the parameters L1, L2, Y1.

(Y1 comes from VARS → YVARS, #Function, Y1)

Step 4. Graph the line of best fit.

To get a predicted value within the window, hit TRACE, up arrow, and type the desired value.