Recall Exercise 5.2.27 about an Italian firm Ma-Vib that was in the news for “sexual discrimination” for having chosen only its female employees to be dismissed. Before the layoffs, Ma-Vib employed 18 women and 12 men; it then fired 15 of the women and none of the men. Is it valid to use the theory-based approach to examine whether the proportion of women fired was significantly higher than the proportion of men fired? Explain your reasoning.