Table 8.25 cross-classifies happiness with family income for the subsample of the 2014 GSS that identified themselves as Jewish.

(a) Give an example of a (i) concordant pair, (ii) discordant pair.

(b) The table has 204 concordant pairs and 55 discordant pairs. Find gamma, and interpret.

(c) Show how to express gamma as a difference between two proportions.