HP 33s - Manual (Page 145)

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 ( xˆ and
yˆ
).
„ Weighted mean (x weighted by y).
„ Summation statistics: n, Σx, Σy, Σx 2
, Σy 2
, and Σxy.
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 registers before entering a new set of
statistical data (press
{ c {;} ).