Consider the following models (i) kids Bo + B₁educ+u where kids is the number of kids ever born to a woman and educ is the number of years of schooling of the woman - (ii) score = Bo+B₁minutes+u where score is the final score of a student in ECON 482 and minutes is the number of minutes of lecture videos watched (iii) log(price) = ßo + ß₁ log(dist) + u where price is the price of a house and dist is the distance from the house to a garbage incinerator. For each, provide an interpretation for ₁, what sign it might have and factors that might be included in the error term u. Based on those factors, argue why or why wouldn't the simple regression model uncover the ceteris parabus (causal) effect of the independent variable on the dependent variable.