standard deviation... Watch

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rachel72
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#1
Report Thread starter 13 years ago
#1
what exactly is it?! i mean, i'm doing maths GCSE coursework and need to include an area of statistics i've not covered in class, but i can only find standard deviation, isn't it something to do with the mean, because i've done histograms and they were skewed and so my teacher said i had to compare the IQR and medians instead of mean and range, so is there anything else to try, should i do standard deviation anyway, or should i just settle for a 7/8?!
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Cortez
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#2
Report 13 years ago
#2
standard deviation measures the spread of data. The higher the standard deviation, the great the spread of data from the mean of the sample. I would include stuff about the standard deviation, better to do more than less in my opinion
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rachel72
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#3
Report Thread starter 13 years ago
#3
so the mean difference between the estimate and actual angle, i might just hand it in and see if she says to do it or not, i'll ask next lesson!
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Newton
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#4
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Standard deviation is the measure of dispersion around the mean value of the sample.

It is given by:

s=sqrt[(Mean value of (x^2))-((Mean value of x)^2)]

Newton.
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Jonny W
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#5
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variance = average of [(deviation from the mean)^2]
SD = sqrt(variance)

Eg, if the data is {1, 3, 5} then the deviations from the mean are -2, 0, 2. So

variance = (1/3)((-2)^2 + 0^2 + 2^2) = 8/3
SD = sqrt(8/3)
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