Chapter 12: Statistics
206
system displays the revised parameter value in the symbolic expression Y=mX+B, and refreshes
the graph with the updated Manual-Fit Line.
Select
y 5
to finish the Manual Fit function. The calculator stores the current mX+b
expression into Y1 and makes that function active for graphing. You can also select Manual-Fit
while on the
Home
screen. You can then enter a different
Y-Var
such as
Y4
and then press
Í
.
This takes you to the Graph screen and then pastes the Manual-Fit equation in the specified
Y-Var
.
In this example,
Y4
.
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.
Variables
1-Var
Stats
2-Var
Stats
Other
VARS
menu
mean of x values
v
v
XY
sum of x values
G
x
G
x
G
sum of x
2
values
G
x
2
G
x
2
G
sample standard deviation of x
Sx
Sx
XY
population standard deviation of x
s
x
s
x
XY
number of data points
n
n
XY
mean of y values
w
XY
sum of y values
G
y
G
sum of y
2
values
G
y
2
G
sample standard deviation of y
Sy
XY
population standard deviation of y
s
y
XY
sum of x
…
y
G
xy
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
