© 1999 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-30X ÙS: A Guide for Teachers
24
WNBA Stats — 2-Variable Statistics
(
Continued)
3. Calculate the statistical data.
You may want to fix the decimal to 2 places
before doing the statistical calculations.
1. Press % ‚.
F0123456789
2. Press
2
.
Ask students:
•
What is the average points scored for the
players shown?
•
What is the average playing time?
•
What is the total number of points scored
per game for all the given players?
You may want to discuss the other statistical
variables and what they mean.
1. Press u.
n Ï Sx Îx Ð
12.00
2. Press " to
Ï
.
n Ï Sx Îx Ð
9.33
3. Press " " " to
Ð
.
n Ï Sx Îx Ð
21.59
4. Press " " " to Ò
x
.
Sy Îy Òx
112.00
4. The form of the equation is
y = ax + b
. Write
the equation for the line of best fit (round to
the nearest hundredth).
1.56x + 7.02
5. The closer the correlation coefficient value is
to 1 (or 1), the better the correlation
between the two variables. Write the
correlation coefficient.
r
= .91
1. Press " until you get to
a
.
This is the slope of the line of
best fit.
ÒXY a
b r
1.56
2. Press " to
b
. This is the
y-intercept of the line.
Ò XY a b
r
7.02
3. Press " to
r
. This is the
correlation coefficient.
ÒXY a b r
0.91
6. Now calculate how many minutes you would
expect a player to play if she averages 15
points per game.
1. Press " " to
y¢
.
x
¢
y
¢
2. Press <.
3. Type
15
E and press <.
y¢(15)
30.44
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