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Question Six: (6 points) Based on the statistical properties of OLS estimators, what is the value of theses terms (bonus grades): a)

`(\sum_(t=1)^n hat(u)_(t))/(n)=`

b)

`\sum_(i=1)^n r_(t)hat(u)_(t)=`

c)

`,\sum_(i=1)^n hat(R)I_(t)hat(u)_(t)=`

d)

`\sum_(t=1)^n hat(u)_(t)=`

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