Getting the Standard Deviation from your calculator:

I have used the following data set to get the mean with several different calculators.

1, 1, 1, 4, 7, 7, 7 standard deviation = 3

Current Calculators that I have in my office:

• Casio fx-115MS
• Casio FX 115 ES
• TI-30Xa
• Ti-30XIIs
• TI-36x
• TI-83, TI-83Plus
• TI-89

There are hundreds of calculators on the market that find the standard deviation. If you do not have one of these calculators, you have several options.

• Look at the manual for your calculator.
• Go to Google and type “standard deviation with __________ calculator”.

Casio fx-115MS

• Click on the Mode button twice until you see “SD”. Select 1. This puts the calculator in Statistics Mode.

• Enter the first number, 1.
• Hit the M+. (n= 1 will appear in the window)
• Enter the second number, 1.
• Hit the M+ key. (n=2 will appear in the window)
• . . . . .
• Enter the last number, 7.
• Hit the M+ key. (n=7 will appear in the window)

• Hit shift, 2. (This invokes the S-Var option.)
• Hit 1 for the sample mean. Hit Enter.
• Hit 3 for the sample standard deviation that we will use in class. Hit Enter.

Casio FX 115 ES

• · MODE button
• · 3 for STAT
• · 1 for 1-VAR
• · Enter your data 1, enter, 1, enter, etc
• · SHIFT 1 for [STAT]
• · 5 for Var
• · 3 for population standard deviation or 4 for sample standard deviation.  Also, 2 for mean. 

TI-30Xa

• Enter the first number, 1.
• Hit the Σ+ (Sigma+) key. ( n=1 will appear in the window)
• Enter the second number, 1.
• Hit the Σ+ (Sigma+) key. (n=2 will appear in the window)
• . . . . .
• Enter the last number, 7.
• Hit the Σ+ (Sigma+) key. (n=7 will appear in the window)
• Hit 2^nd x² (by hitting the 2^nd key you are actually selecting the x-bar written above the key.) This gives you the mean.
• Hit 2^nd sqrt(x). This gives you the sample standard deviation which we will use in class.
• Make sure you turn your calculator off and on for new data sets.

TI-30XIIS

• Hit 2^nd, Data (this means really that you are entering the STAT menu)
• Select 1-Var.
• A blank screen will appear. Select Data again. X₁ will appear.
• Enter in 1. Scroll down, you will see FRQ=1. Scroll down.
• You will see X₂=. Enter 1. Scroll down, you will see FRQ=2. Scroll Down.
• . . . .
• Enter the last number 7. Scroll down, you will see FRQ=7.
• Select STATVAR.
• Use the right arrow key to get: n, x-bar, and s_x. If I ask you to compute the standard deviation by hand, I am looking for s_x— not the other listed values.

TI-36X

• Hit the 2^nd and x<>y button. (This puts us in Statistics 1 mode.)

• Enter the first number, 1.
• Hit the Σ+ (Sigma+) key. (1 will appear in the window)
• Enter the second number, 1.
• Hit the Σ+ (Sigma+) key. (2 will appear in the window)
• . . . . .
• Enter the last number, 7.
• Hit the Σ+ (Sigma+) key. (7 will appear in the window)
• Hit 2^nd x² (by hitting the 2^nd key you are actually selecting the x-bar written above the key.) This gives you the mean.
• Hit 2^nd sqrt(x). This gives you the sample standard deviation which we will use in class.
• Make sure you turn your calculator off and on for new data sets.

TI-83, TI-83 Plus

• Hit 2^nd and click on 0 (by hitting the 2^nd key you are actually selecting the catalog written above the key.)
• Select LN (You are actually selecting the S in green.) This skips you through the catalog through the s’s.
• Use the arrow down key at the top to scroll to stdDev( . Hit Enter.
• This will take you back to the main window. Finish off the statement, so that it looks like this below.

stdDev({1,1,1,4,7,7,7})

Notice the insertion of the curly brackets. These are very important. After the above is entered, hit Enter.

TI-89

• Hit the Catalog key.
• Select 3 (You are actually selecting the S in purple.) This skips you through the catalog through the s’s.
• Use the arrow down key at the top to scroll to stdDev( . Hit Enter.
• This will take you back to the main window. Finish off the statement, so that it looks like this below.

stdDev({1,1,1,4,7,7,7})

Notice the insertion of the curly brackets. These are very important. After the above is entered, hit Enter.