HP 15C Instrukcja Użytkownika Pobierz pdf (Strona 49)

Section 4: Statistics Functions 49

Keystrokes

Display

l´

0.2809

Recall last random number generated,

which is the new seed. (The ´ may be

omitted.)

Accumulating Statistics

The HP-15C performs one- and two-variable statistical calculations. The

data is first entered into the Y- and X-registers. Then the z function

automatically calculates and stores statistics of the data in storage registers

through R

. These registers are therefore referred to as the statistics

registers.

Before beginning to accumulate statistics for a new set of data, press

´ CLEAR ∑ to clear the statistics registers and stack. (If you have

reallocated registers in memory and any of the statistics registers no longer

exist, Error 3 will be displayed when you try to use CLEAR ∑, z, or

w Appendix C explains how to reallocate memory.)

In one-variable statistical calculations, enter each data point (x-value) by

keying in x and then press z.

In two-variable statistical calculations, enter each data pair (the x- and y-

values) as follows:

Key y into the display first.

Press v. The displayed y-value is copied into the Y-register.

Key x into the display.

Press z. The current number of accumulated data points, n, will be

displayed. The x-value is saved in the LAST X register and y remains

in the Y-register. z disable stack lift, so the stack will not lift

when the next number is keyed in.

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 287 288

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HP 15C Instrukcja Użytkownika Strona 49