9) Let {X 1 , X 2 , ... , X n } be a random sample of N observations from the tr
ID: 1094870 • Letter: 9
Question
9)
Let {X1, X2, ... , Xn} be a random sample of N observations from the true but unknown density function N(?, ?2). In other words, Xi ? iid N(?, ?2), i=1,2,...,N. Then, the sample mean (X-bar) is distributed as:
A) N(?, ?2)
N(?, 0)
N(?, ?2/N)
D) ?
10) Y is the salary of workers, X is the number of years of experience of workers, and D is a dummy variable with value 1 if the worker is a male and 0 if the worker is a female. The following equation is estimated over a sample of i=1,...,N workers: Y = a + b*X + c*D + d*(X*D) + e where e is the regression error and a, b, c, and d are the regression coefficients. By how much would an average male's salary increase with one more year of experience?
Y is the salary of workers, X is the number of years of experience of workers, and D is a dummy variable with value 1 if the worker is a male and 0 if the worker is a female. The following equation is estimated over a sample of i=1,...,N workers: Y = a + b*X + c*D + d*(X*D) + e where e is the regression error and a, b, c, and d are the regression coefficients. By how much would an average male's salary increase with one more year of experience?
A) a+c
B) b
C) b + d
D) c+d
A) N(?, ?2)
B)N(?, 0)
C)N(?, ?2/N)
D) ?
10) Y is the salary of workers, X is the number of years of experience of workers, and D is a dummy variable with value 1 if the worker is a male and 0 if the worker is a female. The following equation is estimated over a sample of i=1,...,N workers: Y = a + b*X + c*D + d*(X*D) + e where e is the regression error and a, b, c, and d are the regression coefficients. By how much would an average male's salary increase with one more year of experience?
Y is the salary of workers, X is the number of years of experience of workers, and D is a dummy variable with value 1 if the worker is a male and 0 if the worker is a female. The following equation is estimated over a sample of i=1,...,N workers: Y = a + b*X + c*D + d*(X*D) + e where e is the regression error and a, b, c, and d are the regression coefficients. By how much would an average male's salary increase with one more year of experience?
A) a+c
B) b
C) b + d
D) c+d
Explanation / Answer
1) c) N(?, ?2/N)
2) B) b
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