Texas Instruments TI-83 Plus Silver Edition Bedienungsanleitung

TI-83, TI-83 Plus and the TI-84

GRAPHING CALCULATOR MANUAL

James A. Condor

Manatee Community College

to accompany

Introductory Statistics

Sixth Edition

Prem S. Mann

Eastern Connecticut State University

JOHN WILEY & SONS, INC.

Contents

Preface 3

1 Introduction 4

2 Organizing Data 11

3 Numerical Descriptive Measures 17

4 Probability 27

5 Discrete Random Variables 32

6 Continuous Random Variables 39

7 Sampling Distributions 46

8 Estimation of the Mean and Proportion 50

9 Hypothesis Tests: Mean and Proportion 55

10 Two Populations 61

11 Chi-Square Tests 69

12 Analysis of Variance 74

13 Simple Linear Regression 78

14 Nonparametric Methods 84

Preface

Statistics is an important field of study, now more so than ever. We are surrounded by statistical

information in work and in our everyday lives. Many of us work in professions that require us to

understand statistical summaries, and some of us work in areas that require us to produce

statistical information.

The art of teaching statistics has changed dramatically in recent years, with computational

software eliminating the need for many of the previously taught techniques. The answers to

many of the complex computations come easier and faster students with today’s calculators

performing most of the work in elementary statistical analysis. The challenge to the instructor is

to get the student to acquire a greater understanding of what (s)he is doing, with the calculator

tending to the details of the computations.

The TI-83, TI-83 Plus, and TI-84 Plus calculators, by Texas Instruments, are leading examples of

the progress in statistical technology. Texas Instruments has provided us with advanced devices

at an affordable price that are capable of powerful statistical work and yet is still easy to use.

This text will run through the statistical capabilities of the TI-83, TI-83 Plus, and TI-84 Plus

calculators. The calculators are almost identical with regards to the type of statistical functions

they will perform and the keystrokes needed to call those functions.

This text will follow the order of topics presented in Mann’s Introductory Statistics, sixth edition,

published by John Wiley & Sons, Inc., but should also prove useful with other texts. It will not

explain the underlying statistics but instead focus on how best to use the TI-83, TI-83 Plus, and

TI-84 Plus calculators in computing them.

Chapter

Introduction

Use of Technology

Statistics is a field that deals with sets of data. After the data is collected it needs to be organized

and interpreted. There is a limit to how much of the work can be done effectively without the

help of some type of technology. The use of technology, such as a calculator with enhanced

statistical functions can take care of most of the details of our work so that we can spend more

time focusing on what we are doing and how to interpret the results.

Technology can help us not only to store and manipulate data, but also to visualize what the data

is trying to tell us. As we work with a calculator, we will be able to:

• Enter, revise, and store data.

• Perform statistical computations on stored data or entered statistics.

• Draw pictures, based on the data to help us to understand what useful information can be

inferred from that data.

Advantages of Using a Calculator

There are many good statistical software packages available, such as MINITAB, SAS, and

SPSS. Excel also contains many statistical built-in functions as well as supporting plug-in’s for

statistical work. Still, for the student starting to learn statistics, it’s hard to beat the advantages of

using a powerful hand-held calculator.

• It is portable and easy to use in many different work environments.

• It has battery power that lasts far longer than that of a laptop computer.

• It is less expensive than a computer.

• It is less expensive than a statistical software package.

Advantages to Using the TI-83, TI-83 Plus, and TI-84 Plus

This calculator manual will focus on how to get the most out of using the TI-83, TI-83 Plus, and

the TI-84 Plus calculators by Texas Instruments. The TI-83 was first released in 1996, improving

upon its predecessors the TI-81 and TI-82 with the addition of many advanced statistical and

financial functions. The TI-83 Plus and the TI-84 Plus have essentially the same features as the

TI-83, but with increased memory capacity and a few extra statistical features. They are powerful

calculators with advanced functions, but at the same time easy to use.

• Most complicated statistical computations are handled through menus which prompt

you for the necessary input.

• Data entry and revision is handled through a Stat List Editor that is similar to a

spreadsheet in how it is used.

• Statistical graphs are handled through menus and important parts of the graph can be

read by tracing along with the arrow keys.

• The calculators are built sturdily, and can withstand many falls off of student desks.

Entering and Revising Data

This chapter focuses on getting numbers into your calculator and storing them for the

organization, interpretation, and analysis part of statistics. When you are not given the necessary

statistics to perform calculations, you will need to enter data into the calculator to generate the

statistics. We will learn how to do statistical calculations with the calculator in future chapters.

Using the Stat List Editor

The Stat List Editor in the TI-83, TI-83 Plus, and TI-84 Plus calculators provides a convenient

way to enter numbers and review them. Numbers from a data set can be stored in a list in the

calculator so that we can keep numbers that are related to each other together.

Example: Weights

Suppose that you have ten people in a room, with the following weights in pounds:

131, 114, 167, 180, 126, 134, 188, 175, 133, 130

If we want to do any sort of analysis on these numbers, we will need to get them into the

calculator and keep them together as a group.

Press the STAT key.

To input data or to make changes to an existing set of data values use the Edit function. (number

one under the EDIT list).

Press the number 1key.

If your stat list editor does not show the columns labeled L1, L2, and L3 you can set up the

Editor by selecting SetUpEditor on the previous screen.

Press the STAT key.

Press the 5key.

Press the ENTER key.

If you set up the editor then return to the Edit function. Go ahead and type the ten weights in

under the column labeled L1. Press the ENTER key when you are done with one number and

ready to move on to the next number.

Type in 131 and press the ENTER key.

Type in 114 and press the ENTER key.

Type in 167 and press the ENTER key.

…continue until all the data values have been entered.

Use the up and down arrow keys to go back and forth between the numbers. Try changing the

value of one of the entries by typing in a new weight.

Clearing a List of Data Values

After a list of data values is no longer needed you can delete the values by using one of the

following methods.

1. You can highlight each data value and use the DEL key. This method is slow and clears

the list one data value at a time.

2. You can highlight the list name, for example L1 at the top of the column, and press the

CLEAR key and then press the ENTER key.

3. You can go to the EDIT menu and press the number 4key to clear list.

Press the STAT key.

Press the number 4key.

Press the 2nd key and then press the 1key to get L1.

Press the ENTER key.

Entering Lists Directly

The home screen is where you do most of your calculator work that doesn’t involve menus.

Wherever you are on your calculator, you can always get back to the home screen by pressing

the 2nd key and then the MODE key to access the QUIT function. From the home screen, you

can enter data into a list by typing it between a set of braces { and }, and separating the numbers

by commas:

{131, 114, 167, 180, 126, 134, 188, 175, 133, 130}

Once you’ve typed the numbers in, you will want to save them. Use the store button STO►

followed by L1, L2 or any other list. ( L1 – L6 are above the 1–6 keys.) When you press the

STO►key, the screen will display an arrow going to the right.

{131, 114, 167, 180, 126, 134, 188, 175, 133, 130} →L1

Once you’ve entered a list from the Stat List Editor, you can see the list by typing its name. For

example, if you stored the weights in L1, typing L1 on the home screen will display the list’s

contents. (You will need to use the left and right arrow keys to see all of the list’s contents.)

You can also store data to a name that you create. From the home screen, you can save a list to a

name by using the STO►key.

{131, 114, 167, 180, 126, 134, 188, 175, 133, 130} →WEIGH

If you type in WEIGH on the home screen and press the ENTER key the list of numbers will be

displayed across the screen.

Next we will learn how to create a different name for a list rather than using L1, L2, and so on.

Working with Named Lists

The lists L1 through L6 are good places to work with data if you won’t be needing to save the

data. If, on the other hand, you think that you may need the data later on and don’t want to

accidentally over-write it, you can give the data a name. A list can be named with 1–5

characters. The first character must be a letter or the angle symbol θ“theta”. The other

characters can be a letter, a θ, or a number.

To get letters from the keyboard, press the ALPHA key before each letter that appears above

and to the right of most of the keys. If you are typing several letters in a row, press A-LOCK

(above the ALPHA key), type the letters, and then press the ALPHA key again to release the

lock.

To create a different name for a list within the Stat List Editor,

Press the STAT key.

Press the number 1key.

Press the ▲key to highlight the name at the

top of one of the columns.

Press the 2nd key and then the DEL key to get to

the INS (insert) function.

Type in the name of your new list

(note that the A-LOCK is already turned on for you, so

you don’t need to press the ALPHA key before each letter),

Press the ENTER key.

You are now ready to begin entering data into the newly named list.

Getting the Names of Lists

Some of the commands needed later in this book will require you to type in the name of a list. If

it is one of L1–L6, then you can type it quickly from the keyboard above the 1–6 keys.

On the other hand, you cannot just type the name of a named list from the keyboard using the

ALPHA key. List names on the TI-83, TI-83 Plus, and TI-84 Plus calculators are distinguished

from the names of other variables by a small L to the left of the name. To see this, go into the

LIST menu, and choose one of the list names there by using the arrow keys and then press the

ENTER key.

In general, when you need to supply the name of a list to a command or a menu, use the LIST

page and the NAMES list.

Choosing Lists to Edit

There are several ways to control which lists are displayed in the Stat List Editor. If you press

the STAT key and then the number 5key to get to SetUpEditor, you can use that command with

a series of list names separated by columns. For example,

will configure the Stat List Editor to display lists LAA, LBB, and LCC.

As we saw above, if you enter the command SetUpEditor without any list names the Editor goes

back to showing L1–L6 by default. If you are already in the Stat List Editor, you can use the

arrow keys to highlight the names of lists. If you press INS for insert, you can insert new or

existing lists. If you press the DEL key for delete you delete the list from the editor.

This does not erase the contents list. If you wish to do that, highlight the name of the list and

press the CLEAR button and then the ENTER key. This will leave the list name in the editor

and clear its entries.

Deleting Lists

If you store many lists, programs, etc. on your calculator, it is possible that you may start to run

out of memory. If that should happen go into the MEM menu (above the +key) and follow the

sub-menus for deleting items from your calculator. This is one of the few places where the steps

differ between the TI-83, TI-83 Plus, and TI-84 Plus calculators. Just follow the instructions on

the screen.

Exercises

1. Store the following numbers into the list L2:

11, 23, 35, 47, 59

2. Store the following numbers into the list ABC:

2, 3, 5, 7, 11, 13

3. Configure the Stat List Editor to display lists L2, ABC, and L5.

4. Save the following data in a storage location labeled TIME.

23, 45, 56, 32, 42, 22

Solutions

1. Go to the STAT page and select Edit. If L2 is not one of the lists displayed, use the up arrow

to highlight one of the column titles, press INS for insert and press the ENTER key. Use the

down arrow key to go back down into the column. Type in the numbers, pressing the

ENTER key after each one. If you make a typo, use the arrow keys to highlight the entry and

enter it again.

2. Press the STAT key and select Edit. Use the up arrow to highlight one of the column

titles, press INS for insert. Type ABC and press the ENTER key. Use the down arrow

key to go back down into the column. Type in the numbers, pressing ENTER after

each one. If you make a typo, use the arrow keys to highlight the entry and enter it again.

3. Go to SetUpEditor and type in L2, ABC, L5.

You will need to go to the LIST page and the NAMES list to get the name ABC.

The names will appear as the column labels.

4. Go to the home page and type in {23, 45, 56, 32, 42, 22}→TIME

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