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You used SS. = E(x -x) "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. SS, = EX- (Ex ) n Click the icon for a table of the ages (in years) of shoppers at a local store. (a) Use the shortcut formula to calculate the sample standard deviation. i Data Table - X s = (Simplify your answer. Round to one decimal place as needed.) Shoppers' Ages 15 20 18 22 18 18 17 20 18 14 19 14 18 14 16 17 18 20 18 16 Print Done Enter your answer in the answer box and then click Check Answer. ? part Check Answer remaining Clear All