Texas Instruments TI-84 - Manual (Page 318)

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 Variables Statistical 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 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