We are interested in the effects of temperature on infant mortality and we have the model in fmort; = Bo+B₁ log(cigi) +B₂tempi+B3temp/+u;. Where in fmort, is the number of infant deaths per 1,000 births in city i, cig; is the average number of cigarettes smoked by the mother during pregnancy for births in city i, and temp, is the average daily temperature in city i in degrees Fahrenheit. Suppose we get estimates in fmort; = 5 + 0.2 log(cigi) - 32.5temp; +0.25temp?. (a) (2 points) Is this a level-level, log-level, log-log, or level-log model? (b) (6 points) Interpret the coefficient 3₁ on log (cig), (c) (6 points) What is the expression for the marginal effect of temp on infmort? (d) (6 points) Calculate the marginal effect of temperature on infant mortality when the aver- age temperature is 20 degrees and when the average temperature is 100 degrees. Interpret both of these marginal effects. (e) (5 points) For what temperature do we estimate infant mortality to be the lowest?