Could someone please tell me how to calculate the standard deviation on a calc? (1 Viewer)

[coralie1994]

Thank you, greatly appreciated!

 

[smartalec]

1. press mode
2. press option 2: stat
3. Press 1, 1-var
4. put in all your scores.
5. Press AC
6. Press shift 1
7. Press 4: Var
8.Press either 3 or 4. 3 = population standard deviation and 4 = sample standard deviation - depending on what the question asks you.

and thats it
if you need the frequency on, (E.G. score 2 occurs 5 times):
1. Press shift
2. Press mode
3. Press the 'down' on the replay button
4. Press 3
5. Press 1: frequency on
6. Go back and press mode again
7. Press 2.
8. Press 1

 

[coralie1994]

woo thank you! lifesaver!

 

[1to1 Tutor]

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 :


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 2nd x2 (by hitting the 2nd key you are actually selecting the x-bar written above the key.) This gives you the mean.
Hit 2nd 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 2nd, 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 sx. If I ask you to compute the standard deviation by hand, I am looking for sx— not the other listed values.



TI-36X
Hit the 2nd 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 2nd x2 (by hitting the 2nd key you are actually selecting the x-bar written above the key.) This gives you the mean.
Hit 2nd 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 2nd and click on 0 (by hitting the 2nd 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.

Hope this helps

 

[cutemouse]

Just use the formula. Not that hard...

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