(b) Use the defining formula to compute the sample standard deviation s. 2 (x - x) where x is a Recall the defining formula used to compute the sample standard deviation s member of the data set, x is the mean, and n is number of data values. Before using the formula, we must determine x and n. There are five values in the data set 1, 2, 4, 7, 8, so n = 5 Calculate the mean X- X by taking the average of the data values, which is dividing the sum of the data values by the number of data values 12 4 + 78 4.4 4.4 Step 3 2 In order to use the defining formula for sample standard deviation, it is helpful to first calculate (x - x)* for each data value in the data set 1, 2, 4, 7, 8. Use the values in the data set and the previously determined mean, x4.4, to complete the following table. 2 4 4.4 0.4 8 4.4 3.6 4.4 4.4 3.4 2 11.56 5.76 6.76 X-X
