Consider the following simple regression model y = 
0 + 
1x1 + u. Suppose z is an instrument for x. if Cov(z,u) = 0 and Cov(z,x) 
0, the value of 
1 in terms of population covariances is _____.
Definitions:
General Intelligence
The concept of a common intelligence that influences an individual's performance on various cognitive tasks.
Triarchic Theory
A theory of intelligence proposed by Robert Sternberg, suggesting that human intelligence comprises analytical, creative, and practical dimensions.
Robert Sternberg
An American psychologist known for his theory on intelligence and creativity.
Raymond Cattell
A psychologist known for his work in personality theory and the development of several personality assessments.
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