On a numerical ability test consisting of 10 items, the mean of a group of 50 participants was
7.5 and the SD was 2. For the given data, calculate reliability using method of Rational
Equivalence.
Item Probability of 1 2 3 4 5 6 7 8 9 10
getting the correct answer 0.5, 0.8, 0.4, 0.7, 0.6, 0.7, 0.3, 0.7, 0.5, 0.6