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STD deviation

This topic has 5 replies, 2 voices, and was last updated 9 months ago by John Moffat.

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September 11, 2021 at 8:52 am #635501
johnbriane
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The lower the standard deviation then the less the spread is (if it is 0 then there is no spread at all). The higher the standard deviation then the more the spread.

So sir

How do we identify the spread is low or high

I mean

If it’s -0.8 is it low ?

And if it’s
+0.7 is it high ?
September 12, 2021 at 8:25 am #635552
John Moffat
Keymaster
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The standard deviation is never negative.

The lowest it can be is zero, in which case there is no spread.

There is no maximum, but the higher it is then the more the spread.
September 12, 2021 at 6:21 pm #635603
johnbriane
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But sir in the graph
We have negative points as well right ?
September 13, 2021 at 9:32 am #635639
John Moffat
Keymaster
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That is not because the standard deviation is negative!

The graph is showing the possible outcomes and they can be higher or lower than the average.
September 13, 2021 at 2:44 pm #635672
johnbriane
- Topics: 146
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Ok sir

Then
mean is the average value (or the centre value)… coefficient tells us if the individual salaries are distributed ‘closely’ around the centre(mean) or ‘loosely’ around the centre
September 13, 2021 at 4:44 pm #635682
John Moffat
Keymaster
- Topics: 57
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Correct.
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