HP 15c Collector's Edition User Manual

52 Section 4: Statistics Functions
Correcting Accumulated Statistics
If you discover that you have entered data incorrectly, the accumulated
statistics can be easily corrected. Even if only one value of an (x, y) data
pair is incorrect, you must delete and re-enter both values.
1. Key the incorrect data pair into the Y- and X-registers.
2. Press | w to delete the incorrect data.
3. Key in the correct values for x and y.
4. Press z.
Alternatively, if the incorrect data point or pair is the most recent one
entered and z has been pressed, you can press | K | w to
remove the incorrect data.
*
Example: After keying in the preceding data, Farmer realizes he misread
a smeared figure in his lab book. The second y-value should have been
5.78 instead of 4.78. Correct the data input.
Keystrokes Display
4.78 v
4.78
Keys in the data pair we want
to replace and deletes the
accompanying statistics. The
n-value drops to four.
20 | w
4.00
5.78 v
5.78
Keys in and accumulates the
replacement data pair.
20 z
5.00
The n-value is back to five.
We will use these statistics in the rest of the examples in this section.
*
Note that these methods of data deletion will not delete any rounding errors that may
have been generated in the statistics registers. This difference will not be serious unless
the erroneous pair has a magnitude that is enormous compared with the correct pair, in
such a case, it would be wise to start over!

HP 15c Collector's Edition Specifications

General

Model	HP 15c Collector's Edition
Category	Calculator
Type	Scientific
Power Source	Battery
Manufacturer	HP
Display	LCD
Functions	complex numbers, matrix operations

Summary

Introduction

This Handbook

Outlines the structure of the manual, detailing its parts and how to use it for learning.

The HP Community

Discusses user groups and websites for HP calculator enthusiasts and information sharing.

Part I: HP 15c Fundamentals

Section 1: Getting Started

Covers basic operations like powering on, keyboard layout, and primary/alternate functions.

Section 2: Numeric Functions

Explains essential numeric operations including logs, trig, powers, and conversions.

Section 3: The Automatic Memory Stack, LAST X, and Data Storage

Details the RPN stack, LAST X register, and data storage operations.

Part II: HP 15c Programming

Section 6: Programming Basics

Introduces core programming concepts: creating, loading, running programs, and memory.

Section 8: Program Branching and Controls

Covers controlling program flow using branching, loops, and conditional tests.

Part III: HP 15c Advanced Functions

Section 11: Calculating With Complex Numbers

Covers entering, manipulating, and performing calculations with complex numbers.

Section 12: Calculating With Matrices

Explains matrix operations, including dimensioning, element access, and calculations.

Section 13: Finding the Roots of an Equation

Details using the SOLVE function for numerical root finding and equation solving.

Section 14: Numerical Integration

Explains how to perform numerical integration using the ∫f(x)dx key and subroutines.

Appendix A: Error Conditions

Error 8: No Root

Explains the error when the SOLVE function cannot find a root.

Error 0: Improper Mathematics Operation

Lists and explains errors related to mathematical operations and illegal arguments.

Appendix D: A Detailed Look at SOLVE

How SOLVE Works

Explains the numerical technique and logic behind the SOLVE algorithm.

Finding Several Roots

Discusses methods for finding multiple roots of an equation using the SOLVE function.