Head start is an intensive program for young children

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5. [4 points] "Head Start" is an intensive program for young children and their parents  aimed at raising achievement.  In order to evaluate the effectiveness of this program, in  2002 the department of Health and Human Services (HHS) randomly assigned 5,000  three-and four-year-old children to one of two groups: "a  Head Start group that had  access to Head Start program services or a control group that did not have access to Head  Start, but could enroll in other early childhood programs or services" (quoting from HHS  website).  Though some in the control group did enroll in early childhood programs  (including Head Start), those in the Head Start group were significantly more likely to. So far, the kids in the study have been followed through first grade, when a variety of test  score outcomes were examined.  At this point there were sometimes differences between  the Head Start group and the control in test scores (which we'll call "the estimated effect"  of Head Start) but they were rarely statistically significant.  You decide to redo the  analysis, controlling for other influences of test scores, like family background, in a  multivariate regression.  Which is true (select one)? a. Adding controls should have little impact on the estimated effect. b. Adding controls is likely to raise the standard errors c. Both Use the STATA output below to answer the following questions. Page      2     of 3 **DONT FORGET BACK OF PAGE**    
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. reg cesh08 cesh40 pctimm pcthisp pctbl pctfem Source | SS df MS Number of obs = 157 -------------+------------------------------ F( 5, 151) = 38.04 Model | .352239017 5 .070447803 Prob > F = 0.0000 Residual | .279615415 151 .001851758 R-squared = 0.5575 -------------+------------------------------ Adj R-squared = 0.5428 Total | .631854432 156 .004050349 Root MSE = ?
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  • Fall '09
  • Econometrics, Mean squared error, Head Start, causal effect, Head Start group, **DONT FORGET

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