- The McNemar chi-square is computed using only the two cells of the previous table where customers changed their preferences from before to after the promotion. Continuity is corrected because the chi-square statistic is used to approximate a discrete distribution.

- The asymptotic significance is the approximate probability of obtaining a chi-square statistic as extreme as 5.959 in repeated samples, if the frequencies of the two change conditions are only randomly different.

Because a chi-square this large is unlikely to have arisen by chance, the manager rejects the null hypothesis of no difference in favor of her hypothesis that the promotion had a favorable effect.