This is the cookie-cutter flaw of hasty generalization. But the author doesn't attempt to prove an overly broad generalization about all job performance. Instead, she uses an example of clerical workers to draw a conclusion about those same clerical workers.

This is the cookie-cutter flaw of circular reasoning, where the conclusion simply restates a premise. The author’s premises and conclusion are distinct. One premise points out a correlation between positive attitudes and job performance, while her conclusion is about causation.

It doesn't matter whether the secretaries have positive attitudes toward other activities outside of work. The argument just addresses their positive attitudes toward work, claiming that this causes their excellent job performance.

This is the flaw of equivocation, where an argument uses one term in different ways. The author doesn’t make this mistake; she uses “positive attitudes” clearly and consistently throughout her argument, always referring to the secretaries’ positive attitudes toward their work.

The author argues that the positive attitudes caused excellent performance, without considering that excellent performance might actually have caused the positive attitudes. She sees a correlation between X and Y, then jumps to the conclusion that X caused Y.