midterm2-2013-SPRING_ANS

# midterm2-2013-SPRING_ANS - Name Section Johns Hopkins...

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Name: Section # Johns Hopkins University Economics 180.334 Spring 2013 Midterm # 2 Thursday, March 28, 2013 Instructions: 1. Time limit: 70 minutes 2. Total number of points is 70. The number of points for each problem indicates the approximate time in minutes that should be allocated to the problem 3. The exam is closed book/notes. You are allowed to use a 1-sided, letter size, cheat sheet 4. You can use a hand calculator. Cellphones/Smartphones are not allowed 5. You get an extra point if you write a check mark next to the odd numbered instructions 6. To receive full credit for your answers, you have to explain your calculations 7. When you conduct a hypothesis test, please state clearly: the null hypothesis and alternative hypothesis, the formula and value of your test statistics, acceptance or rejection rules (based on correct critical values), and the outcome of your test 8. A standard normal distribution function and critical values for the χ 2 q distribution are included at the back of this booklet. Good luck! 1

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1. A problem of interest to policy makers and health officials is to determine the effects of smoking during pregnancy on infant health. One measure of infant health is birth weight; a birth weight that is too low can put an infant at risk for contracting var- ious illnesses. After recognizing that other factors may also affect birth weight, the researcher proposes the following model bwght i = β 0 + β 1 cigs i + β 2 boy i + β 3 white i + β 4 motheduc i + u i
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• Fall '15
• Balat
• Econometrics, Null hypothesis, researcher, birth weight

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