Operation Manual

Chapter 12: Statistics 215
Statistical Variables
The statistical variables are calculated and stored as indicated below. To access these variables for use in
expressions, press , and select
5:Statistics. Then select the VARS menu shown in the column below
under VARS menu. If you edit a list or change the type of analysis, all statistical variables are cleared.
Q1 and Q3
The first quartile (Q1) is the median of points between minX and Med (median). The third quartile
(Q3) is the median of points between Med and maxX.
Variables
1-Var
Stats
2-Var
Stats Other
VARS
menu
mean of x values vv XY
sum of x values Gx Gx G
sum of x
2
values Gx
2
Gx
2
G
sample standard deviation of x Sx Sx XY
population standard deviation of x sx sxXY
number of data points n n XY
mean of y values w XY
sum of y values Gy G
sum of y
2
values Gy
2
G
sample standard deviation of y Sy XY
population standard deviation of y syXY
sum of x … y Gxy G
minimum of x values minX minX XY
maximum of x values maxX maxX XY
minimum of y values minY XY
maximum of y values maxY XY
1st quartile Q1 PTS
median Med PTS
3rd quartile Q3 PTS
regression/fit coefficients a, b EQ
polynomial,
Logistic, and SinReg
coefficients
a, b, c,
d, e
EQ
correlation coefficient r EQ
coefficient of determination
r
2
, R
2
EQ
regression equation RegEQ EQ
summary points (
Med-Med only) x1, y1, x2,
y2, x3, y3
PTS