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| number of data points in the population |
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| population standard deviation |
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| Calculate Standard Deviation |
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1. find mean
2. for each data pt, find the square of its distance to the mean
3. Sum the values from step2
4. Divide by the # of data pts
5. Take the square root |
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x1 mean of group 1
x2 mean of group 2
s= standard deviation
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x1 mean of group 1
x2 mean of group 2
s= standard deviation
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