User Manual

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Table Of Contents

Contents
Getting Acquainted — Read This First!
Chapter 1 Basic Operation
- 1. Keys
- 2. Display
- 3. Inputting and Editing Calculations
- 4. Using the Math Input/Output Mode
- 5. Option (OPTN) Menu
- 6. Variable Data (VARS) Menu
- 7. Program (PRGM) Menu
- 8. Using the Setup Screen
- 9. Using Screen Capture
- 10. When you keep having problems…
Chapter 2 Manual Calculations
- 1. Basic Calculations
- 2. Special Functions
- 3. Specifying the Angle Unit and Display Format
- 4. Function Calculations
- 5. Numerical Calculations
- 6. Complex Number Calculations
- 7. Binary, Octal, Decimal, and Hexadecimal Calculations with Integers
- 8. Matrix Calculations
- 9. Vector Calculations
- 10. Metric Conversion Calculations
Chapter 3 List Function
- 1. Inputting and Editing a List
- 2. Manipulating List Data
- 3. Arithmetic Calculations Using Lists
- 4. Switching between List Files
- 5. Using CSV Files
Chapter 4 Equation Calculations
- 1. Simultaneous Linear Equations
- 2. High-order Equations from 2nd to 6th Degree
- 3. Solve Calculations
Chapter 5 Graphing
- 1. Sample Graphs
- 2. Controlling What Appears on a Graph Screen
- 3. Drawing a Graph
- 4. Saving and Recalling Graph Screen Contents
- 5. Drawing Two Graphs on the Same Screen
- 6. Manual Graphing
- 7. Using Tables
- 8. Modifying a Graph
- 9. Dynamic Graphing
- 10. Graphing a Recursion Formula
- 11. Graphing a Conic Section
- 12. Drawing Dots, Lines, and Text on the Graph Screen (Sketch)
- 13. Function Analysis
Chapter 6 Statistical Graphs and Calculations
- 1. Before Performing Statistical Calculations
- 2. Calculating and Graphing Single-Variable Statistical Data
- 3. Calculating and Graphing Paired-Variable Statistical Data (Curve Fitting)
- 4. Performing Statistical Calculations
- 5. Tests
- 6. Confidence Interval
- 7. Distribution
- 8. Input and Output Terms of Tests, Confidence Interval, and Distribution
- 9. Statistic Formula
Chapter 7 Financial Calculation
- 1. Before Performing Financial Calculations
- 2. Simple Interest
- 3. Compound Interest
- 4. Cash Flow (Investment Appraisal)
- 5. Amortization
- 6. Interest Rate Conversion
- 7. Cost, Selling Price, Margin
- 8. Day/Date Calculations
- 9. Depreciation
- 10. Bond Calculations
- 11. Financial Calculations Using Functions
Chapter 8 Programming
- 1. Basic Programming Steps
- 2. Program Mode Function Keys
- 3. Editing Program Contents
- 4. File Management
- 5. Command Reference
- 6. Using Calculator Functions in Programs
- 7. Program Mode Command List
- 8. CASIO Scientific Function Calculator Special Commands <=> Text Conversion Table
- 9. Program Library
Chapter 9 Spreadsheet
- 1. Spreadsheet Basics and the Function Menu
- 2. Basic Spreadsheet Operations
- 3. Using Special Spreadsheet Mode Commands
- 4. Conditional Formatting
- 5. Drawing Statistical Graphs, and Performing Statistical and Regression Calculations
- 6. Spreadsheet Mode Memory
Chapter 10 eActivity
- 1. eActivity Overview
- 2. eActivity Function Menus
- 3. eActivity File Operations
- 4. Inputting and Editing Data
Chapter 11 Memory Manager
- 1. Using the Memory Manager
Chapter 12 System Manager
- 1. Using the System Manager
- 2. System Settings
Chapter 13 Data Communication
- 1. Performing Data Communication between the Calculator and a Personal Computer
- 2. Performing Data Communication between Two Calculators
- 3. Connecting the Calculator to a Projector
Chapter 14 Geometry
- 1. Geometry Mode Overview
- 2. Drawing and Editing Objects
- 3. Controlling the Appearance of the Geometry Window
- 4. Using Text and Labels in a Screen Image
- 5. Using the Measurement Box
- 6. Working with Animations
Chapter 15 Picture Plot
- 1. Picture Plot Function Menus
- 2. Managing Picture Plot Files
- 3. Using the Plot Function
- 4. Using the Plot List
- 5. Common Functions with the Graph Mode
Chapter 16 3D Graph Function
- 1. Example of Drawing in the 3D Graph Mode
- 2. 3D View Window
- 3. 3D Graph Function List
- 4. 3D Graph Function Selection Screen
- 5. 3D Graph Screen
Chapter 17 Python (fx-CG50, fx-CG50 AU only)
- 1. Python Mode Overview
- 2. Python Function Menu
- 3. Inputting Text and Commands
- 4. Using the SHELL
- 5. Editing a py File
- 6. File Management (Searching For and Deleting Files)
- 7. File Compatibility
- 8. Sample Scripts
Appendix
- 1. Error Message Table
- 2. Input Ranges
Examination Mode
E-CON4 Application
- 1. E-CON4 Mode Overview
- 2. Sampling Screen
- 3. Auto Sensor Detection (CLAB Only)
- 4. Selecting a Sensor
- 5. Configuring the Sampling Setup
- 6. Performing Auto Sensor Calibration and Zero Adjustment
- 7. Using a Custom Probe
- 8. Using Setup Memory
- 9. Starting a Sampling Operation
- 10. Using Sample Data Memory
- 11. Using the Graph Analysis Tools to Graph Data
- 12. Graph Analysis Tool Graph Screen Operations
- 13. Calling E-CON4 Functions from an eActivity

6-47

6. Confidence Interval

A confidence interval is a range (interval) that includes a statistical value, usually the

population mean.

A confidence interval that is too broad makes it difficult to get an idea of where the population

value (true value) is located. A narrow confidence interval, on the other hand, limits the

population value and makes it difficult to obtain reliable results. The most commonly used

confidence levels are 95% and 99%. Raising the confidence level broadens the confidence

interval, while lowering the confidence level narrows the confidence level, but it also

increases the chance of accidently overlooking the population value. With a 95% confidence

interval, for example, the population value is not included within the resulting intervals 5% of

the time.

When you plan to conduct a survey and then t test and Z test the data, you must also consider

the sample size, confidence interval width, and confidence level. The confidence level changes

in accordance with the application.

1-Sample Z Interval calculates the confidence interval for an unknown population mean when

the population standard deviation is known.

2-Sample

Z Interval calculates the confidence interval for the difference between two

population means when the population standard deviations of two samples are known.

1-Prop

Z Interval calculates the confidence interval for an unknown proportion of successes.

2-Prop

Z Interval calculates the confidence interval for the difference between the proportion

of successes in two populations.

1-Sample

t Interval calculates the confidence interval for an unknown population mean when

the population standard deviation is unknown.

2-Sample

t Interval calculates the confidence interval for the difference between two

population means when both population standard deviations are unknown.

On the initial Statistics mode screen, press 4(INTR) to display the confidence interval

menu, which contains the following items.

• 4(INTR) 1(Z) ... Z intervals (page 6-48)

2(t) ...

t intervals (page 6-49)

After setting all the parameters, use c to move the highlighting to “Execute” and then press

the function key shown below to perform the calculation.

• 1(CALC) ... Performs the calculation.

• There is no graphing for confidence interval functions.