deviation method

Deviation method for calculating standard deviation
Consider the observations 8,25,7,5,8,3,10,12,9.
1. First, calculate the mean and determine N.
2. Remember, the mean is the sum of scores divided by N where N is the number of scores.
3. Therefore, the mean = (8+25+7+5+8+3+10+12+9) / 9 or 9.67
4. Then, calculate the standard deviation as illustrated below.
squared
score mean deviation* deviation *deviation from mean=score-mean
8 9.67 - 1.67 2.79
25 9.67 +15.33 235.01
7 9.67 - 2.67 7.13
5 9.67 - 4.67 21.81
8 9.67 - 1.67 2.79...