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What is the interpretation of b0

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Suppose you are interested in estimating the effect of hours spent in an SAT preparation course (hours) on total SAT score (sat). The population is all college-bound high school seniors for a particular year.

(i) Suppose you are given a grant to run a controlled experiment. Explain how you would structure the experiment in order to estimate the causal effect of hours on sat.

(ii) Consider the more realistic case where students choose how much time to spend in a preparation course, and you can only randomly sample sat and hours from the popu- lation. Write the population model as sat 5 b0 1 b1hours 5 u where, as usual in a model with an intercept, we can assume E(u) 5 0. List at least two factors contained in u. Are these likely to have positive or negative correlation with hours?

(iii) In the equation from part (ii), what should be the sign of b1 if the preparation course is effective?

(iv) In the equation from part (ii), what is the interpretation of b0?

Reference no: EM13882622

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