13-28 Inferential Statistics and Distributions
8313INFE.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:47 PM Printed: 02/19/01 1:38 PM
Page 28 of 36
The inferential statistics variables are calculated as indicated below. To access
these variables for use in expressions, press
,
5
(
5:Statistics
), and then
select the
VARS
menu listed in the last column below.
Variables
Tests
Intervals
LinRegTTest,
ANOVA
VARS
Menu
p-value
p
p
TEST
test statistics
z
,
t
,
c
2
,
Ü
t
,
Ü
TEST
degrees of freedom
df
df
df
TEST
sample mean of x values for
sample 1 and sample 2
v
1
,
v
2
v
1
,
v
2
TEST
sample standard deviation of x
for sample 1 and sample 2
Sx1,
Sx2
Sx1
,
Sx2
TEST
number of data points for sample
1 and sample 2
n1
,
n2
n1
,
n2
TEST
pooled standard deviation
SxP
SxP
SxP
TEST
estimated sample proportion
Ç
Ç
TEST
estimated sample proportion for
population 1
Ç
1
Ç
1
TEST
estimated sample proportion for
population 2
Ç
2
Ç
2
TEST
confidence interval pair
lower
,
upper
TEST
mean of x values
v
v
XY
sample standard deviation of x
Sx
Sx
XY
number of data points
n
n
XY
standard error about the line
s
TEST
regression/fit coefficients
a
,
b
EQ
correlation coefficient
r
EQ
coefficient of determination
r
2
EQ
regression equation
RegEQ
EQ
Test and Interval Output Variables