mica-lwe
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I'm a bit confused as to what standard deviation in general means, can someone clarify it please?
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StrangeBanana
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It's an indicator of how "spread out" the data is. A large standard deviation means the data varies a lot from the mean, a small one means the data points are relatively close to the mean.
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Virolite
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(Original post by StrangeBanana)
It's an indicator of how "spread out" the data is. A large standard deviation means the data varies a lot from the mean, a small one means the data points are relatively close to the mean.
What he said^
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WhiteGroupMaths
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Standard deviation can be interpreted as a "standard" categorization of differences, so to speak.

Say for a certain test, the mean mark is 65, and the standard deviation is 5 marks.

So if a student scores 75 marks, it can be seen as 10 marks more than 65, or 2 standard deviations to the right of the mean mark.

On the other hand, if a student scores say 55 marks, it can be seen as 10 marks lesser than 65, or 2 standard deviations to the left of the mean mark.

Hope this helps. Peace.
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