Statistics 12-29
8312STAT.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:42 PM Printed: 02/19/01 1:37
PM Page 29 of 38
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.
Variables 1.Var
Stats 2.Var
Stats Other VARS
menu
mean of x values vv XY
sum of x values GxGxG
sum of x2 values Gx2Gx2G
sample standard deviation of xSxSx XY
population standard deviation of xsxsxXY
number of data points nn XY
mean of y values wXY
sum of y values GyG
sum of y2 values Gy2G
sample standard deviation of ySy
XY
population standard deviation of ysyXY
sum of x … yGxy 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 Q1PTS
median Med PTS
3rd quartile Q3PTS
regression/fit coefficients a, bEQ
polynomial, Logistic, and SinReg
coefficients a, b, c,
d, eEQ
correlation coefficient rEQ
coefficient of determination r2, R2EQ
regression equation RegEQ EQ
summary points (Med.Med only) x1, y1, x2,
y2, x3, y3 PTS
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.
Statistical Variables
Q1 and Q3