A sales manager examined age data, education level, a personality measure that indicated introvertedness/extrovertedness, and levels of sales attained by the company’s 120-person sales force. The technique used was regression analysis. After analyzing the data, the sales manager said, “It is apparent to me that the higher the level of education and the greater the degree of extrovertedness a salesperson has, the higher an individual’s level of sales will be. In other words, a good education and being extroverted cause a person to sell more.” Would you agree or disagree with the sales manager’s conclusions? Why?