CASIO fx-82AU User Manual

Casio fx-82AU

Statistical calculations

Learning Skills

The math will disappear from the screen. While in Math mode your answer will be given as fractions, even if you put in the information using the ÷ key. This is mentioned in our math handout

Until this is reversed your answers will be read as decimals.

Introduction:

This sheet will teach you how to use the Casio fx82AU calculator to perform statistical operations. See also our handout for mathematical functions. Any further queries please contact Student Central.

This sheet will teach you to:

Change settings on your calculator Put your calculator into statistical mode Enter observations Display the descriptive statistics Enter group data Perform linear regression

1. Settings on your calculator

To turn your calculator on: ON Your screen should show a small D and Math at the top of the screen You need to change a couple of default settings before you start.

Once you change these they will stay changed and will enable you to better use your calculator.

1. Get out of Math mode into linear mode Calculator steps: shift setup 2

2. Change the default so that small decimal answers read in decimal format rather than exponent format. To check if this needs to happen

Enter 1 ÷ 200 = If your answer shows as

Calculator steps: shift setup 8 2

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Frequency mode

This will enable you to enter a score and its frequency. Each score will have a frequency of 1 unless you use the right-arrow to enter a frequency cell and overwrite that frequency. See the section entering observations from a frequency table on how to enter data.

2. Calculation Mode

This is the mode where you perform all your standard or non-statistical functions

Calculator steps: MODE 1

3. Statistics Mode

This will enable you to enter data for descriptive statistical analysis. To put your calculate into statistical mode

Calculator steps: MODE 2 1 If you are entering data that is in a frequency table you then

need to do the following Calculator steps: SHIFT SETUP down arrow 3 1 To turn the frequency off Calculator steps: SHIFT SETUP down arrow 3 2

To clear the statistical memory, exit stats mode back to comp mode and re-enter stats mode, this should be done before entering any new data

Calculator steps: MODE 1 MODE 2 1

To check stored data: SHIFT 1 2

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4. Entering single variable observations

Calculator symbol

Common symbol

Calculator steps

answer mean

or x

AC shift 1 5 2 =

12.75

Sample standard deviation

1nx

AC shift 1 5 4 =

2.5

Population standard deviation

AC shift 1 5 3 =

2.165 Sample variance

AC shift 1 5 3 =

6.25

Scores added up

x x

AC 1 4 2 =

51 Scores squared

then added up

AC shift 1 4 1 =

669

Number of scores

The number of scores (n) is 4 this is displayed while entering

AC after entering

You press AC after you have finished entering data to tell the calculator that you have completed.

It is also necessary in between displaying the descriptive statistics to clear the previous value

Descriptive Statistics

The equal sign must be pressed at the end to bring up the value of the descriptive statistic you are after.

To enter observations press = after entering the observation

Example 2.1

Enter 10, 12, 13, 16

Calculator steps: 10 = 12 = 13 = 16 = AC

5. Display the Descriptive Statistics

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