Texas Instruments MathPrint TI-30X Pro Manual Book page 41

If the teacher adds 4 points to Test 4, Anthony's average grade is 12.
³ Problem
The table below gives the results of a braking test.
Test No.
Speed (kph)
Braking distance (m)
Use the relationship between speed and braking distance to estimate the braking
distance required for a vehicle travelling at 55 kph.
A hand-drawn scatter plot of these data points suggest a linear relationship. The
calculator uses the least squares method to find the line of best fit, y '= ax '+ b , for data
entered in lists.
v v $ $ $
<
$ 49 $ 65 $ 79 $ " 5.3 $ 14.45
33
$ 20.21 $ 38.45 <
% s
% u
(Selects 2-VAR STATS )
3
$ $ $
<
Press $ as necessary to view a and b .
This line of best fit, y '=0.67732519 x 'N18.66637321 models the linear trend of the data.
Press $ until y' is highlighted.
1 2
33 49
5.30 14.45
3 4
65 79
20.21 38.45
Math Functions 37