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U 7 ' You used SSx = 2(x - )1) 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 nd the sample variance by dividing the sum of squares by n - 'l, and the sample standard deviation by nding the square root of the sample variance. Complete parts (a) and (b) below. 2 2x 55)( = 2x2 ( ) 0 Data Table n g Click the icon for a table of the ages (in years) of shoppers at a local store. Shoppers' Ages 18 23 s = |:| 16 15 (Simplify your answer. Round to one decimal place as needed.) 22 19 18 16 (a) Use the shortcut formula to calculate the sample standard deviation