QUESTION 7 If E(X) = 0, then V(X) must equal to: OA 0 Ов. 1 OC E(X2) D.none of the above

Microeconomic Theory
12th Edition
ISBN:9781337517942
Author:NICHOLSON
Publisher:NICHOLSON
Chapter2: Mathematics For Microeconomics
Section: Chapter Questions
Problem 2.16P
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QUESTION 7
If E(X)= 0, then V(X) must equal to:
OA 0.
О в. 1
OC E(X2)
O D. none of the above.
QUESTION 8
Let X be any random variable, then V( V( X) +1) =
OA. 0.
O B. some positive number.
OC. V(X).
O D. none of the above
QUESTION 9
An assumption of Cov( u1. u2 ) # 0, is likely to be suitable for the linear model with:
OA. a cross-sectional data set.
O B. a time series data set.
OC. an ideal data set where there is no correlation between the u's
O D. none of the above
Transcribed Image Text:how? please QUESTION 7 If E(X)= 0, then V(X) must equal to: OA 0. О в. 1 OC E(X2) O D. none of the above. QUESTION 8 Let X be any random variable, then V( V( X) +1) = OA. 0. O B. some positive number. OC. V(X). O D. none of the above QUESTION 9 An assumption of Cov( u1. u2 ) # 0, is likely to be suitable for the linear model with: OA. a cross-sectional data set. O B. a time series data set. OC. an ideal data set where there is no correlation between the u's O D. none of the above
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