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Texas Instruments TI-86 User Manual

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Chapter 14: Statistics

193

14STATS.DOC TI-86, Chap 14, US English Bob Fedorisko Revised: 02/13/01 2:33 PM Printed: 02/13/01 3:04 PM Page 193 of 14

14STATS.DOC TI-86, Chap 14, US English Bob Fedorisko Revised: 02/13/01 2:33 PM Printed: 02/13/01 3:04 PM Page 193 of 14

Result
Variables

1-Var
Stats

2-Var
Stats

Other

Result
Variables

1-Var
Stats

2-Var
Stats

Other

mean of x values

v

v

correlation coeff

corr

pop std dev of x

s

x

s

x

y-intercept of reg eq

a

sample std dev of x

Sx

Sx

slope of reg eq

b

mean of y values

w

regression

àfit coeff

a

,

b

pop std dev of y

s

y

number of data pts

n

n

sample std dev of y

Sy

min of x values

minX

minX

sum of x values

G

x

G

x

max of x values

maxX

maxX

sum of x

2

values

G

x

2

G

x

2

min of y values

minY

sum of y values

G

y

max of y values

maxY

sum of y

2

values

G

y

2

median

Med

sum of x ¹ y

G

xy

1st quartile

Qrtl1

regression equation

RegEq

3rd quartile

Qrtl3

polynomial,

LgstR

,

and

SinR

coeff’s

a

(y-int)

b

(slope)

polynomial

LgstR

,

and

SinR

reg coeff’s

PRegC

The first quartile (

Qrtl1

) is the median of the points between

minX

and

Med

(median). The

third quartile (

Qrtl3

) is the median of the points between

Med

and

maxX

.

When you calculate a logistic regression,

1

is stored to

tolMet

(

tolMe

) if the TI

-86 internal

tolerance was met before the calculator arrived at a result; if not met,

0

is stored to

tolMet

.

These words are abbreviated
in the table:
pop = population
std dev = standard deviation
coeff = coefficient
int = intercept
reg eq = regression equation
pts = points
min = minimum
max = maximum