vafi88
Posts: 2981
Joined: Sun Apr 08, 2001 10:32 am

A Little Help With Standard Deviation - Please

Fri Mar 05, 2004 11:02 am

Hey guys. I've been procrastinating a little bit, and with the test tomorrow, I'm having to write out the whole equation (which takes about 10 minutes and is about 3 miles long). I need to know how to plug it into my TI-83 so I can actually do all of the problems on my test tomorrow. I know how to get to the standard deviation. I get to:

2nd - Stat, then scroll to MATH, and then go down to StdDev(


I don't know what to plug into the parenthasies from StdDEV(

If any of you can help, it'd greatly be appreciated.
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jhooper
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Joined: Thu Dec 13, 2001 8:27 pm

RE: A Little Help With Standard Deviation - Please

Fri Mar 05, 2004 1:48 pm

Well, I can't remember how to work the TI-83, but if all else fails, Standard Deviation isn't all that hard to do on pencil and paper, assuming you don't have lots of weird numbers  Big grin
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7574EVER
Posts: 462
Joined: Sun Jan 04, 2004 4:47 pm

RE: A Little Help With Standard Deviation - Please

Fri Mar 05, 2004 2:00 pm

Here's the way my professor taught us to do it. Remember the acronym..

The first letter of each word is the next step that needs to be done.

1.)Mean - figure out the mean (average) of all the numbers being used
2.)Dogs - figure out the deviation of all the numbers being used
3.)Send - square each of the deviations
4.)Meannies - figure out the mean of all the new numbers from step three.
5.)Running- then get the square root of the answer to step four.

After step five you should have the standard deviation.

I know you wanted to know how to put in into the TI-83, but since I can't help you there hopfully this can make it easier if you end up doing it on paper
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L-188
Posts: 29874
Joined: Wed Jul 07, 1999 11:27 am

RE: A Little Help With Standard Deviation - Please

Fri Mar 05, 2004 2:09 pm

Sorry can't help.

My graphing calculator is a Casio.
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TYSGoVols
Posts: 610
Joined: Mon Jan 26, 2004 3:44 am

RE: A Little Help With Standard Deviation - Please

Sat Mar 06, 2004 4:43 am

If you can figure out teh variance then SD is not that hard

V squared = SD

SD suqare rooted = V

Not sure of any huge formulas though.

<>< Garen
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