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 VariablesStatistical VariablesStatistical VariablesStatistical 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.
Variab les 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 x Sx Sx XY
population standard deviation of x sxsxXY
number of data points n n XY
mean of y values wXY
sum of y values GyG
sum of y2 values Gy2G
sample standard deviation of y Sy XY