Below is a table indicating an expected total income over a 40-year working life for over300,000people.Basedon the data from this table,researcher Awas able to come up with a meaningful regression equation and concluded that there is a linear relationship between education level and income. While the overall pattern does indicate a linear relationship, one of the critics argues that there is a conceptual flaw in this regression analysis by researcher A.The critic stresses that one of the assumptions in regression analysis is violated. What do you think is the most significant conceptual problem of the conclusion?

Degrees earnedExpected Income (total)

High School$1.2 Million

2-yr Associate$1.6 Million

4-yr College B.A.$2.1 Million

Master's Degree$2.5 Million

Professional Degree$4.4 Million

Doctoral Degree$3.4 Million