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Earn +20 ptsQ: How do you calculate standard deviation if I know variance?
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What is the definition of standard deviation?
Standard deviation is how much a group deviates from the whole. In order to calculate standard deviation, you must know the mean.
How do you calculate the expected value when you know the standard deviation?
You cannot; there is insufficient information.
What is the standard deviation if all data points are different?
It depends on the data. The standard deviation takes account of each value, therefore it is necessary to know the values to find the sd.
Why you measure standard deviation?
The idea is to know how much the values "spread out" from the average.
What information must you know in order to completely specify the shape of a normal distribution?
the mean and the standard deviation
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