Consider the following simple linear regression model: y: [30 +B1x1 + u. Let y be wage and x1 be years of education. Which of the following statements is correct? A 0 Finding that1 is statistically signicant at the 1% level implies that years of education has a causal effect on wage level. CI Finding that beta with hat on top subscript 1 is statistically signicant at the 1% level implies that the average level of wage changes with years of education. 0 Finding that beta with hat on top subscript 1 is statistically signicant at the 1% level implies that wage level has a causal effect on years of education. O All of the above