User guide

Statistical Operations 11–1
11
Statistical Operations
The statistics menus in the HP 33s provide functions to statistically analyze a set of
one– or two–variable data:

Mean, sample and population standard deviations.

Linear regression and linear estimation (
x
ˆ
and
y
ˆ
).

Weighted mean (x weighted by y).

Summation statistics: n,
Σ
x,
Σ
y,
Σ
x
2
,
Σ
y
2
, and
Σ
xy.
Entering Statistical Data
One– and two–variable statistical data are entered (or deleted) in similar fashion
using the

(or
{
) key. Data values are accumulated as summation
statistics in six
statistics registers (28 through 33), whose names are displayed in
the SUMS menu. (Press
|
and see
Q;º;¸;º

;¸

;º¸
).
Note
Always clear the statistics re
g
isters before enterin
g
a new set of
statistical data (press
{c
{
;
} ).