上游充通大 ParisTech SHANGHAI JIAO TONG UNIVERSITY INSTITUT DES SCIENCES ET TECHNOLOGIES PARIS INSTITUTE OF TECHNOLOGY Sample Problem: Simple Statistics The numerator is the sum of these squared “deviations”across all the data. Suppose our data was 2,4,6,9,and 13. The mean is 6.8 The numerator of the standard deviation is (6.8-2)}+(6.8-4)2+(6.8-6)}2+(6.8-9)2+(6.8-13)°=149.6 s9574-61 9Sample Problem: Simple Statistics • The numerator is the sum of these squared “deviations” across all the data. • Suppose our data was 2, 4, 6, 9, and 13. – The mean is 6.8 – The numerator of the standard deviation is 9           2 2 2 2 2 6.8 2 6.8 4 6.8 6 6.8 9 6.8 13 149.6 149.6 37.4 6.11 5 1 s              