MATH& 146

Lesson 7

Graphing Calculators

1

Basics of the Graphing

Calculator

Lightening/Darkening

Sometimes, your calculator screen may appear

blank, but you may not need a new battery. You

may just need to darken your screen.

To darken your screen, press and hold down

the up arrow until the screen is as dark as

you want. (If you let go of the arrow, then you

must repeat this process.)

Use and to lighten the screen.

2

Example 1

It is important to keep the order of operation in

mind when entering arithmetic expressions in the

calculator.

For example, calculate . 58 49

4.5

3

Example 2

Use the caret key, , to express that a value is

being raised to an exponent.

For example, calculate .6.02

4

E Notation

Because superscripted exponents like 10 –11

cannot always be conveniently displayed, the letter

E is often used to represent times ten raised to the

power of (which would be written as "×10b") and is

followed by the value of the exponent.

6.4E –11 = 6.4×10 –11 = .000000000064.

5

Example 3

Rewrite each of the following numbers in standard

notation.

a) 1.24 E –4

b) 8.84 E –8

6

STAT Submenus

Get to know the STAT button

and its submenus, we'll be

using these all quarter.

7

Lists

The graphing calculators use lists to store and

manipulate sets of data. The TI-83 and TI-84

calculators have six default lists, L1 through L6.

(Other lists can be named and created.)

8

ENTER

1-Var Stats

The following is a sample of 19 exam grades.

Enter the data in list L1.

Done right, your calculator should look like:

9

76 74 82 96 66 76 78 72 52 68

86 84 62 76 78 92 82 74 88

1-Var Stats

Choose 1-Var Stats (one-variable statistics) to

analyze data.

10

OR

1-Var Stats

= sample mean

Σx = sum of all data

Σx2 = sum of squares of data

Sx = sample standard deviation

σx = population standard

deviation

n = sample size

11

x

1-Var Stats

minX = minimum data value

Q1 = lower quartile

Med = median

Q3 = upper quartile

maxX = maximum data value

12

Example 4

Calculate the mean, median, and standard

deviation from the following list of data. Round to

three significant digits, if necessary.

13

1 1 1 8 12 15 18 18 21 96

Clearing a List

To clear a list, move the cursor over the list, press

CLEAR, then press ENTER

14

1) Highlight the list. 2) Press CLEAR. 3) Press ENTER.

ENTERCLEAR

1-Var Stats with Frequencies

One question in a nutrition study asked the individuals

in the study to give the number of groups included in

their daily meals. The results are given below.

Enter the Number of food groups in list L1 and the

frequencies in list L2.15

Number of food groups Frequency

2 1

3 3

4 7

5 12

6 8

1-Var Stats with Frequencies

This time, you will need to specify the frequencies.

16

OR

1-Var Stats with Frequencies

17

x = sample mean

Σx = sum of all data

Σx2 = sum of squares of data

Sx = sample standard deviation

σx = population standard

deviation

n = sample size

1-Var Stats with Frequencies

minX = minimum data value

Q1 = lower quartile

Med = median

Q3 = upper quartile

maxX = maximum data value

18

Example 5

Calculate the mean, median, and standard

deviation from the following list of data. Round to

three significant digits, if necessary.

19

Data Values Frequency

0 20

1 15

2 32

3 12

4 2

5 14

6 7