1. Select all of the following statements which you believe to be true. The standard deviation of a set of observations:

		Is a measure of 'location'
		Is the square root of the variance so it can only be determined if all the values in the data set are positive.
		Has the same units of measurement as the raw data.
		Is a measure of spread which is equal to the range.
		Is unaffected by outliers.
		Is an inappropriate measure of spread for skewed data