HP 15c Scientific registers, statistics

Keystrokes Display

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Section 4: Statistics Functions 49

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 R2 through R7. 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 wAppendix 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:

1.Key y into the display first.

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

3.Key x into the display.

4.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.