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Chapter 12: Statistics 315
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
Statistical VariablesStatistical Variables
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
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 sx
XY
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