Maternal iron stores transferred to the fetus during the end stages of pregnancy generally run out by the time an infant is six months old. Iron is important for cognitive development. What is the best source of dietary iron for a 12-month-old child?Question 5 options:Whole cow’s milk and yogurtDark green leafy vegetables such as kale or spinachEggs and nutsIron-fortified breakfast cereal or small amounts of lean meat

 

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A pregnant woman needs an extra 450 calories above the allowance for nonpregnant women during which trimester(s)? a. First b. Second c. Tird d. First, second, and third

 

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ABC Corporation has $5 million of long-term debt, $1 million of preferred stock, and $5 million of common stock on its balance sheet. The market value of the debt is 80% of the book value, the market value of preferred stock is 70% of book value, and the market value of common stock is 130% of book value. The after-tax costs of existing debt, existing preferred stock, and existing common stock are 6%, 9%, and 15%, respectively.

 

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C15 The data set HAPPINESS.RAW contains independently pooled cross sections for the even years from 1994 through 2006, obtained from the General Social Survey. The dependent variable for this problem is a measure of “happiness,” vhappy, which is a binary variable equal to one if the person reports being “very happy” (as opposed to just “pretty happy” or “not too happy”).

(i)        Which year has the largest number of observations? Which has the smallest? What is the percentage of people in the sample reporting they are “very happy”?

(ii)      Regress vhappy on all of the year dummies, leaving out y94 so that 1994 is the base year. Compute a heteroskedasticity-robust statistic of the null hypothesis that the pro- portion of very happy people has not changed over time. What is the p-value of the test?

(iii)     To the regression in part (ii), add the dummy variables occattend and regattend. Inter- pret their coefficients. (Remember, the coefficients are interpreted relative to a base group.) How would you summarize the effects of church attendance on happiness?

(iv)    Define a variable, say highinc, equal to one if family income is above $25,000. (Unfortunately, the same threshold is used in each year, and so inflation is not accounted for. Also, $25,000 is hardly what one would consider “high income.”) Include highinc, unem10, educ, and teens in the regression in part (iii). Is the coefficient on regattend affected much? What about its statistical significance?

(v)      Discuss the signs, magnitudes, and statistical significance of the four new variables in part (iv). Do the estimates make sense?

(vi)    Controlling for the factors in part (iv), do there appear to be differences in happiness by gender or race? Justify your answer.

 

 

 

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