You used SS, (x-x)2 when calculating variance and standard deviation. An alternative formula for the standard deviation that is sometimes convenient for hand calculations is shown below. You can find the sample variance by dividing the sum of squares by n-1, and the sample standard deviation by finding the square root of the sample variance. Complete parts (a) and (b) below. (2x)² ss, X Data table Click the icon for a table of the ages (in years) of shoppers at a lo Shoppers' Ages 20 W 19 18 14 0 20 16 17 (a) Use the shortcut formula to calculate the sample standard deviatio 15 16 17 16 16 23 14 16 (Simplify your answer. Round to one decimal place as needed.) 14 14 20 15 16 Print Done

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