The table below summarizes results from an experiment in which subjects were classified as asthmatic or nonasthmatic and then given a treatment. After the treatment, they were again classified as asthmatic or nonasthmatic. Identify the
Discordant pairs of results.

A) The discordant pairs of results are (1) the 13 subjects who were asthmatic before the treatment and nonasthmatic after the treatment, and (2) the 12 subjects who were nonasthmatic before the treatment and nonasthmatic after the treatment.
B) The discordant pairs of results are (1) the 13 subjects who were nonasthmatic before the treatment and asthmatic after the treatment and (2) the 2 subjects who were asthmatic before the treatment and nonasthmatic after the treatment.
C) The discordant pairs of results are (1) the 2 subjects who were nonasthmatic before the treatment and asthmatic after the treatment, and (2) the 7 subjects who were asthmatic before the treatment and asthmatic after the treatment.
D) The discordant pairs of results are (1) the 2 subjects who were nonasthmatic before the treatment and asthmatic after the treatment, and (2) the 13 subjects who were asthmatic before the treatment and nonasthmatic after the treatment.

Question

The table below summarizes results from an experiment in which subjects were classified as asthmatic or nonasthmatic and then given a treatment. After the treatment, they were again classified as asthmatic or nonasthmatic. Identify the
Discordant pairs of results.

A) The discordant pairs of results are (1) the 13 subjects who were asthmatic before the treatment and nonasthmatic after the treatment, and (2) the 12 subjects who were nonasthmatic before the treatment and nonasthmatic after the treatment. 
B) The discordant pairs of results are (1) the 13 subjects who were nonasthmatic before the treatment and asthmatic after the treatment and (2) the 2 subjects who were asthmatic before the treatment and nonasthmatic after the treatment. 
C) The discordant pairs of results are (1) the 2 subjects who were nonasthmatic before the treatment and asthmatic after the treatment, and (2) the 7 subjects who were asthmatic before the treatment and asthmatic after the treatment. 
D) The discordant pairs of results are (1) the 2 subjects who were nonasthmatic before the treatment and asthmatic after the treatment, and (2) the 13 subjects who were asthmatic before the treatment and nonasthmatic after the treatment.

Quizplus · Accepted Answer

Discordant pairs are those where the subjects change from being asthmatic to nonasthmatic or nonasthmatic to asthmatic after the treatment. So, the first discordant pair is (2) the 2 subjects who were nonasthmatic before the treatment and asthmatic after the treatment, and the second discordant pair is (1) the 13 subjects who were asthmatic before the treatment and nonasthmatic after the treatment, making choice D the correct answer.

The Table Below Summarizes Results from an Experiment in Which