Texas Instruments BA-20 Profit Manager User Manual - Page 68

Resetting Statistics Worksheet Variables, Entering Data Points, Predicted Y value

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Variable Key Display Variable Type Number of observations # (as Mean (average) of X values needed) Sample standard deviation of X Population standard deviation of X Mean (average) of Y values Sample standard deviation of Y Population standard deviation of Y Linear regression y-intercept Linear regression slope Correlation coefficient Predicted X value Predicted Y value Sum of X values Sum of X squared values Sum of Y values Sum of Y squared values Sum of XY products n v Sx sx y** Sy** sy** a** b** r** X'** Y'** GX GX2 GY** GY2** GXY** Auto-compute Auto-compute Auto-compute Auto-compute Auto-compute Auto-compute Auto-compute Auto-compute Auto-compute Auto-compute Enter/compute Enter/compute Auto-compute Auto-compute Auto-compute Auto-compute Auto-compute * nn represents the number of the current X or Y value. ** Not displayed for one-variable statistics. *** This guidebook categorizes calculator variables by their method of entry. (See "Types of Worksheet Variables" on page 17.) Resetting Statistics Worksheet Variables • To clear all X and Y values as well as all values in the statistics portion of the worksheet without affecting the statistics calculation method, press & z while in the data-entry portion of the worksheet (& j). • To reset the statistics calculation method to LIN and clear all values except X and Y, press & z while in the calculation method and computation portion of the worksheet (& k). • To reset the statistics calculation method to LIN and clear all values, including X and Y, press & } !. Entering Data Points • You can enter up to 50 (x,y) data points. • If you press # or " to move through the portion of the worksheet that displays results without entering data points, the calculator will display an error. 64 Statistics Worksheet

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64
Statistics Worksheet
*
nn
represents the number of the current X or Y value.
**
Not displayed for one-variable statistics.
*** This guidebook categorizes calculator variables by their method of
entry. (See “
Types of Worksheet Variables
” on page 17.)
Resetting Statistics Worksheet Variables
•
To clear all
X
and
Y
values as well as all values in the statistics portion
of the worksheet without affecting the statistics calculation method,
press
& z
while in the data-entry portion of the worksheet
(
& j
).
•
To reset the statistics calculation method to
LIN
and clear all values
except
X
and
Y
, press
&z
while in the calculation method
and computation portion of the worksheet (
&k
).
•
To reset the statistics calculation method to
LIN
and clear all values,
including
X
and
Y
, press
& } !
.
Entering Data Points
•
You can enter up to 50 (
x,y
) data points.
•
If you press
#
or
"
to move through the portion of the worksheet
that displays results without entering data points, the calculator will
display an error.
Number of observations
Mean (average) of X values
Sample standard deviation of X
Population standard deviation of X
Mean (average) of Y values
Sample standard deviation of Y
Population standard deviation of Y
Linear regression y-intercept
Linear regression slope
Correlation coefficient
Predicted X value
Predicted Y value
Sum of X values
Sum of X squared values
Sum of Y values
Sum of Y squared values
Sum of XY products
#
(as
needed)
n
v
Sx
s
x
y
**
Sy**
s
y**
a**
b**
r**
X'**
Y'**
G
X
G
X
2
G
Y**
G
Y
2
**
G
XY**
Auto-compute
Auto-compute
Auto-compute
Auto-compute
Auto-compute
Auto-compute
Auto-compute
Auto-compute
Auto-compute
Auto-compute
Enter/compute
Enter/compute
Auto-compute
Auto-compute
Auto-compute
Auto-compute
Auto-compute
Variable
Key
Display
Variable Type