Statistics Worksheet Variables

Variable

Key

Display

Variable Type

Current X value
Current Y value

& j #

Xnn*
Ynn*

Enter-only
Enter-only

Standard linear regression
Logarithmic regression
Exponential regression
Power regression
One-variable statistics

& k & V

LIN
Ln
EXP
PWR
1-V

Setting
Setting
Setting
Setting
Setting

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
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. Types of Worksheet Variables

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.
• When you enter data for one-variable statistics, Xnn represents the value and Ynn specifies the number of occurrences (frequency).
• When you enter a value for Xnn, the value for Ynn defaults to 1.

Analyzing One-Variable Statistics

To analyze one-variable statistics, select 1-V. Only values for n, v, Sx, sX, GX, and GX2 are computed and displayed for one-variable statistics.

Analyzing Two-Variable Statistics

You can choose from among these four regression-analysis methods:

• LIN
• Ln
• EXP
• PWR

Computing Values Automatically

Except for the predicted X' and Y' values, the calculator computes and displays values for statistics variables automatically when you access them.

Using X' and Y' for Regression Predictions

To use the X' and Y' variables for regression predictions, you either can enter a value for X' to compute Y' or enter a value for Y' to compute X'.