If researcher wish to compare six brands of HDTVs on the basis of quality,how many paired comparisons will be necessary?
A)3
B)6
C)15
D)30

Question

Quizplus · Accepted Answer

To compare six brands of HDTVs on the basis of quality, we need to make a paired comparison between each possible pair of brands. 
The number of paired comparisons required is given by the formula (n*(n-1))/2 where n is the number of items to be compared. 
Plugging in the value of n=6 we get, (6*(6-1))/2 = 15. 
Therefore, the correct answer is 15, which is option C.

If Researcher Wish to Compare Six Brands of HDTVs on the Basis