Sloane conducted a study on years of completed education and income at age 40. She found that for every additional year of education a participant had completed, their annual income at age 40 increased by exactly $1,000. Which of the following statements regarding Sloane's research is NOT true? O Years of completed education caused an increase in income at age 40. Sloane observed a perfect correlation between years of completed education and income at age 40. O Years of completed education was positively related to income at age 40. O Participants with more education tended to make more money at age 40