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Casio FX-9750GII-SC User Guide - Page 175

Confidence Interval, General Confidence Interval Precaution

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6. Confidence Interval Important! • Confidence interval calculations cannot be performed on the fx-7400GII. 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 STAT mode screen, press (INTR) to display the confidence interval menu, which contains the following items. • (INTR)(Z) ... Z intervals (page 6-36) (t) ... t intervals (page 6-37) After setting all the parameters, use A to move the highlighting to "Execute" and then press the function key shown below to perform the calculation. • (CALC) ... Performs the calculation. • There is no graphing for confidence interval functions. S General Confidence Interval Precaution Inputting a value in the range of 0 C-Level < 1 for the C-Level setting sets a value you input. Inputting a value in the range of 1 C-Level < 100 sets a value equivalent to your input divided by 100. 6-35

Section	Page
Contents	3
Getting Acquainted — Read This First!	6
Chapter 1 Basic Operation	8
1. Keys	8
2. Display	9
3. Inputting and Editing Calculations	12
4. Using the Math Input/Output Mode	17
5. Option (OPTN) Menu	29
6. Variable Data (VARS) Menu	30
7. Program (PRGM) Menu	32
8. Using the Setup Screen	33
9. Using Screen Capture	36
10. When you keep having problems...	37
Chapter 2 Manual Calculations	39
1. Basic Calculations	39
2. Special Functions	44
3. Specifying the Angle Unit and Display Format	48
4. Function Calculations	49
5. Numerical Calculations	59
6. Complex Number Calculations	68
7. Binary, Octal, Decimal, and Hexadecimal Calculations with Integers	71
8. Matrix Calculations	74
9. Metric Conversion Calculations	86
Chapter 3 List Function	90
1. Inputting and Editing a List	90
2. Manipulating List Data	94
3. Arithmetic Calculations Using Lists	99
4. Switching Between List Files	102
Chapter 4 Equation Calculations	103
1. Simultaneous Linear Equations	103
2. High-order Equations from 2nd to 6th Degree	104
3. Solve Calculations	106
Chapter 5 Graphing	107
1. Sample Graphs	107
2. Controlling What Appears on a Graph Screen	108
3. Drawing a Graph	112
4. Storing a Graph in Picture Memory	116
5. Drawing Two Graphs on the Same Screen	117
6. Manual Graphing	118
7. Using Tables	121
8. Dynamic Graphing	126
9. Graphing a Recursion Formula	128
10. Graphing a Conic Section	133
11. Changing the Appearance of a Graph	133
12. Function Analysis	135
Chapter 6 Statistical Graphs and Calculations	141
1. Before Performing Statistical Calculations	141
2. Calculating and Graphing Single-Variable Statistical Data	144
3. Calculating and Graphing Paired-Variable Statistical Data	149
4. Performing Statistical Calculations	155
5. Tests	162
6. Confidence Interval	175
7. Distribution	178
8. Input and Output Terms of Tests, Confidence Interval, and Distribution	190
9. Statistic Formula	193
Chapter 7 Financial Calculation (TVM)	196
1. Before Performing Financial Calculations	196
2. Simple Interest	197
3. Compound Interest	198
4. Cash Flow (Investment Appraisal)	200
5. Amortization	202
6. Interest Rate Conversion	204
7. Cost, Selling Price, Margin	205
8. Day/Date Calculations	206
9. Depreciation	207
10. Bond Calculations	209
11. Financial Calculations Using Functions	211
Chapter 8 Programming	212
1. Basic Programming Steps	212
2. PRGM Mode Function Keys	213
3. Editing Program Contents	214
4. File Management	216
5. Command Reference	218
6. Using Calculator Functions in Programs	232
7. PRGM Mode Command List	248
8. Program Library	253
Chapter 9 Spreadsheet	255
1. Spreadsheet Basics and the Function Menu	255
2. Basic Spreadsheet Operations	256
3. Using Special S • SHT Mode Commands	268
4. Drawing Statistical Graphs, and Performing Statistical and Regression Calculations	269
5. S • SHT Mode Memory	274
Chapter 10 eActivity	276
1. eActivity Overview	276
2. eActivity Function Menus	277
3. eActivity File Operations	278
4. Inputting and Editing Data	279
Chapter 11 Memory Manager	289
1. Using the Memory Manager	289
Chapter 12 System Manager	300
1. Using the System Manager	300
2. System Settings	300
Chapter 13 Data Communications	304
1. Connecting Two Units	304
2. Connecting the Calculator to a Personal Computer	304
3. Performing a Data Communication Operation	305
4. Data Communications Precautions	308
5. Screen Image Send	314
Chapter 14 Using SD Cards (fx-9860G SD only)	318
1. Using an SD Card	318
2. Formatting an SD Card	320
3. SD Card Precautions during Use	320
Appendix	321
1. Error Message Table	321
2. Input Ranges	325
E-CON2 Application	327
1 E-CON2 Overview	329
2 Using the Setup Wizard	330
3 Using Advanced Setup	340
4 Using a Custom Probe	354
5 Using the MULTIMETER Mode	360
6 Using Setup Memory	361
7 Using Program Converter	365
8 Starting a Sampling Operation	370
9 Using Sample Data Memory	373
10 Using the Graph Analysis Tools to Graph Data	376
11 Graph Analysis Tool Graph Screen Operations	380

Match case Limit results 1 per page

6-35

6. Confidence Interval

Important!

• Confidence interval calculations cannot be performed on the fx-7400G

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

test and

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

Interval

calculates the confidence interval for an unknown population mean when

the population standard deviation is known.

2-Sample

Interval

calculates the confidence interval for the difference between two

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

1-Prop

Interval

calculates the confidence interval for an unknown proportion of successes.

2-Prop

Interval

calculates the confidence interval for the difference between the proportion

of successes in two populations.

1-Sample

Interval

calculates the confidence interval for an unknown population mean when

the population standard deviation is unknown.

2-Sample

Interval

calculates the confidence interval for the difference between two

population means when both population standard deviations are unknown.

On the initial

STAT

mode screen, press

(INTR) to display the confidence interval menu,

which contains the following items.

•

(INTR)

(Z) ...

intervals (page 6-36)

(t) ...

intervals (page 6-37)

After setting all the parameters, use

to move the highlighting to “Execute” and then press

the function key shown below to perform the calculation.

•

(CALC) ... Performs the calculation.

• There is no graphing for confidence interval functions.

General Confidence Interval Precaution

Inputting a value in the range of 0

C-Level < 1 for the C-Level setting sets a value you input.

Inputting a value in the range of 1

C-Level < 100 sets a value equivalent to your input divided

by 100.