STANDARD DEVATION.
- Locked due to inactivity on Aug 4, '16 4:26pm
Thread Topic: STANDARD DEVATION.
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I NEED HELP. What the f--- is Standard Devation? EXPLAIN ALL OF IT. But please make it simple enough for a confused little child to understand.
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GUYS HELP MEEEEEE.
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HAS ANYONE TAKEN ALGEBRA 1????
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I am taking algebra 1
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O.C?
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DO YOU KNOW WHAT STANDARD DEVIATION IS?
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Here's an example. Suppose we have two groups of people and these are their ages:
Group A: ... 8, 8, 9, 35
Group B: ... 15, 15, 14, 16
The mean age for both groups is 15 years. The standard deviations are 116 and 08. This shows you that the ages in group A are much more spread out than the ages in group B (if everybody in a group was the same age the standard deviation would be 0).
That's how standard devation works -
Why would the deviations be 116 and 8? HOW DID YOU GET 116 AND 8? OH IS IT THE RANGE BETWEEN THE MEAN OF THE 2 AGE GROUPS? BUT NO THEN THAT WOULD BE 0. But the process on my sheet makes it confusing. I don't get it.
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Get it? Tell me if you don't. So i can explain it.
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Okay so first find the mean of the problem.
Tell me when you have. -
Okay. I'll use a simpler problem. 1,2,3,4,5. 15. 15/5=3. 3.
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Another example: your friends have just measured the heights of your dogs (in millimeters):
The heights (at the shoulders) are: 600mm, 470mm, 170mm, 430mm and 300mm.
Find out the Mean, the Variance, and the Standard Deviation.
You find the mean first, here is how:
Mean =
600 + 470 + 170 + 430 + 300
=
1970
= 394
5
mean (average) height is 394 mm
Now you calculate each dogs difference from the Mean:
Then calculate the rest of the numbers by the mean
To calculate the Variance, take each difference, square it, and then average the result:
And the Standard Deviation is just the square root of Variance, so:
Standard Deviation: = 21,704 = 147.32... = 147 (to the nearest mm)
Get it? -
I know what the mean is. Mean, mode, range, median. All this shizz. The variance...that's not on the sheet. She explained something else. I still don't get it. Just explain a simple defenition of standard deviation please....? I'm really sorry I'm making you type all of this when I still don't understand, but I'm trying really hard to. Ugh....I give up.
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It's okay.
Here is another example:
Here's an oversimplified example you can use to help explain the concet:
If your teacher announced that the average score on the latest test was an 80% and the standard deviation was 5, then about two-thirds of the students would get between a 75 and 85 on the test.
Basically, it's how tight around the average, each score was. -
Ya know what I'm done I give up. Thanks anyways. I mean it, thanks so much. Sorry for wasting your time... ._.
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