Which of Mill's Methods Is Illustrated in the Following Passage

Which of Mill's Methods is illustrated in the following passage? If, in your opinion, the conclusion reached indicates that an inadequate hypothesis was employed, explain why and formulate a better hypothesis.
A criminologist hypothesized that the rate of unemployment is causally connected with the rate of violent crime. Observing that the crime rate increased as the level of unemployment increased and decreased as unemployment decreased, she concluded that the rate of violent crime in a community has a direct causal effect on the rate of unemployment.