In a study of two groups, the following results were obtained:

Group A 
Group B 
Sample size 
20 
25 
Sample mean 
22 
23 
Sample standard deviation 
10 
12 
Which of the following statements is correct?
Concept:
\({\rm{Coefficient\;of\;variation}} = \frac{{{\rm{standard\;deviation}}}}{{{\rm{mean}}}}\)
Calculation:
Coefficient of variation for Group A = 10/22 = 0.4545
Coefficient of variation for Group B = 12/23 = 0.522
Group A is less variable than Group B because Group A's coefficient of variation is smaller.