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Select allof the true statements ahout the standard deviation of a quantitative variable. on represents how far a group of values are from the mean of those values, on average. Standard deviation is never negative. If a set of values has a mean of 0 and a standard deviation of will have no effect on the standard deviation. The standard deviation of a set of values is equal to 0 if and only if all of the values are the same. Changing the units of a set of values (eg. converting from inches to feet) does not affect its standard deviation. Standard deviation is resistive to unusual values that is not 0, then removing a data point with a value
math   Statistics-And-Probability   
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