Which logical fallacy is used in the text?
Since Emma Wilkinson became vice president of the parent-teacher association, student performance has declined and teacher morale is down. We on the school board believe that Wilkinson bears sole responsibility for the downtrend.

 - false causation: the assumption that because two things happened together, one caused the other
 - hasty generalization: a very broad claim based on very little evidence
The text argues that Emma Wilkinson is responsible for the decline in student performance and teacher morale. However, even though things declined after Wilkinson became vice president of the parent-teacher association, that doesn't necessarily mean that she caused the downturn. This illustrates a type of logical fallacy known as false causation.