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S
Statistical Calculations
The
and (&)
keys are used to enter and delete
statistical data for one- and two-variable statistics. Sum-
mation data is accumulated in registers R, through Rg.
Once you enter the data, you can use the statistical func-
tions to calculate:
B Mean and standard deviation.
B Linear regression and linear estimation.
® Weighted mean.
B Summation statistics: n, Zx, 2x?, 2y, Zy%, and Zay.
Entering Statistical Data
There is no limit to the number of values you can accumulate in the
statistical registers. However, if statistical data causes the value of a
statistical register to exceed +9.99999999999 x 1049, the HP-20S
displays a temporary overflow warning (OFLO).
The statistical registers, R, through Ry, can be used to store data for
other than statistical use. To clear any data that may have been previ-
ously stored, press (] [CLZ].
Entering Data for One-Variable Statistics
To enter x data for one-variable statistics:
1. Clear any previous contents of R, through Ry by pressing
(] (eLz).
5: Statistical Calculations
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