Observation

This question was reported to be very popular among the candidates and they performed very well in it. According to the report, majority of them were able to recall the appropriate formula, substituted the values and simplified correctly to obtain the expected result. However, a few of them were reported to have quoted the formula wrongly. They wrote  instead of 1 - . Others ranked the values again which was not necessary since we were told that they were ranks. Candidates were expected to obtain the following table

Thereafter, candidates would calculate the required coefficient using the formula
ρ = 1 - , where n = 5, Σd2 = 10. i.e. ρ = 1 -  = 0.5