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Texas Instruments TI-80 Manual

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9-14 Statistics
Pressing
A 9
accesses the STAT CALC menu, where you select and perform
statistical calculations. The TI
-
80 can analyze one-variable or two-variable
statistics. Both can have associated frequency lists.
EDIT CALC
1: 1-VAR STATS
Calculates 1-variable statistics.
2: 2-VAR STATS
Calculates 2-variable statistics.
3: LINREG(aX+b)
Fits data to linear model.
4: QUADREG
Fits data to quadratic model.
5: LINREG(a+bX)
Fits data to linear model.
6: LNREG
Fits data to logarithmic model.
7: EXPREG
Fits data to exponential model.
8: PWRREG
Fits data to power model.
To select and perform statistical calculations:
1. Select a calculation type by pressing its corresponding
number on the
STAT CALC
menu. The name of the
calculation is copied to the Home screen.
2. Enter the name(s) of the list(s) to be used in the
calculation. If you enter more than one list name, separate
them by commas.
3. Press
¸
to perform the calculation and display the
results.
For all of the calculation types, you can include a list of data
occurrences, or frequencies. These indicate how many times
the corresponding data points or data pairs occur in the data
set you are analyzing.
For example, if
L1={15.5,12.1,9.8,14.7,15}
and
L2={1,4,1,3,3}
,
then the instruction
1-VAR STATS L1,L2
would assume that
15.5 occurred one time, 12.1 occurred four times, 9.8 occurred
one time, and so on.
Frequencies must be greater than or equal to zero. At least
one frequency in the list must be greater than zero.
Noninteger frequencies are valid. This is useful in entering
frequencies expressed as percentages or parts that add up to
1. Noninteger frequencies, however, may prevent the
calculation of certain variables.
Statistical Analysis
STAT CALC
Menu
Selecting and
Performing a
Statistical
Calculation
Frequency of
Occurrence for
Data Points
… 140 …


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