For a given sample size,how many pairs of observations will be present?
A) n(n - 1)/2
B) n/2
C) n - 2/2 + n
D) P - Q/P + Q
E) none of the above

Question

Quizplus · Accepted Answer

In a sample of size n, each observation can be paired up with each of the other (n-1) observations, but since order doesn't matter (e.g., comparing A to B is the same as comparing B to A), each pair is counted twice. Therefore, the total number of pairs is n(n-1)/2.

For a Given Sample Size,how Many Pairs of Observations Will