HP 35s HP 35s scientific calculator - User Guide - Page 167
Statistical Operations, Entering Statistical Data
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12 Statistical Operations The statistics menus in the HP 35s provide functions to statistically analyze a set of one- or two-variable data(real numbers): 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, Σx2, Σy2, 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 (-27 through -32), whose names are displayed in the SUMS menu. (Press and see Note Always clear the statistics registers before entering a new set of statistical data (press Statistical Operations 12-1