The Standard Deviation is a measure of how spread out numbers are.Its symbol is σ (the greek letter sigma). The formula is easy: it is the square root of the Variance. So now you ask, "What is the Variance?". The Variance is defined as the average of the squared differences from the mean.
Example:
The heights (at the shoulders) are: 600mm, 470mm, 170mm, 430mm and 300mm. Find out the Mean, the Variance, and the Standard Deviation. Your first step is to find the Mean:
| Mean = |
600 + 470 + 170 + 430 + 300
| = |
1970
| = 394 |
5
|
5
|
I like your example! It helped me better visualize and understand the topic of variance. Thanks! :)
ReplyDeleteThis was helpful because I am taking AP stats next year, and I hear this is similar to the stuff we learn. I know it's Tidious though.
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