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Unformatted text preview: 1 EEP 118 / IAS 118 Elisabeth Sadoulet and Ben Crost University of California at Berkeley Fall 2009 Introductory Applied Econometrics Midterm examination Scores add up to 50 (5 points for each subquestion) Your name:________________________________________ SID:__________________________ SID _______________________________ 2 1. (5 points) X and Y are two random variables with means X and Y , variances var X ( ) and var Y ( ) , and covariance cov X , Y ( ) . Compute the mean and variance of the following random variable: Z = 3 X ! 2 Y + 1 2 (5 points) To investigate possible gender discrimination in a firm, a sample of 100 men and 64 women with similar job descriptions are selected at random and independently. A summary of the resulting monthly salaries is: Average Standard Number of salary deviation observations Men $3100 $200 100 Women $2900 $320 64 Do these data provide statistically significant evidence that the wages of men and women are different? 3. (5 points) Use the results in Table 1 (last page of exam). How much of the variation in soda prices is explained by the presence of competition and the proportion of black people in a neighborhood? SID _______________________________ 2 1. (5 points) X and Y are two random variables with means X and Y , variances var X ( ) and var Y ( ) , and covariance cov X , Y ( ) . Compute the mean and variance of the following random variable: Z = 3 X ! 2 Y + 1 2 (5 points) To investigate possible gender discrimination in a firm, a sample of 100 men and 64 women with similar...
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 Spring '11
 elizabeth
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