Select all of the true statements about the standard deviation
of a quantitative variable.
-The standard deviation of a set of values is equal to 0 if and
only if all of the values are the same.
-The standard deviation of a group of values is a measure of how
far the values are from the mean.
-If a set of values has a mean of 0 and a standard deviation
that is not 0, then removing a data point with a value of 0 will
have no effect on the standard deviation.
-Standard deviation is resistive to unusual values.
-Standard deviation is always a nonnegative value.
-Changing the units of a set of values (e.g., converting from
inches to feet) does not affect its standard deviation.