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66 Statistics Worksheet
Correlation Coefficient
The calculator also determines r, the correlation coefficient, which measures
the goodness of fit of the equation with the data. Generally:
The closer r is to 1 or -1, the better the fit.
The closer r is to zero, the worse the fit.
Entering Statistical Data
Because the Statistics worksheet lets you enter and display up to 50 data
points, and then stores the values until you clear the worksheet or change the
values, you probably will not have to perform every step for each Statistics
calculation.
1. To select the data-entry portion of the Statistics worksheet, press & j.
X01 is displayed along with any previous value.
2. To clear the worksheet, press & z.
3. Key in a value for X01 and press !.
For one-variable data, X01 is the first data point.
For two-variable data, X01 is the first X value.
4. To display the Y01 variable, press #.
5. Key in a value for Y01 and press !.
For one-variable data, you can enter the number of times the X value
occurs (frequency).
The default value is 1.
For two-variable data, enter the first Y value.
6. To display the next X variable, press #.
7. Repeat steps 3 through 5 until you enter all of the data points.
Note: To easily scroll up or down through a range of variables, press and
hold # or ".
Computing Statistical Results
Selecting a Statistics Calculation Method
1. Press & k to select the statistical calculation portion of the Statistics
worksheet.
72

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