Homework Answers
Cov((T,N)=E(TN)-E(T)E(N)=E{NE(T|N)}-E(T)E(N)=E(N*700N)-1153.53*1.6479
=700*{V(N)+E2(N)}-1153.53*1.6479
=700*(.7427+1.6479*1.6479)-1153.53*1.6479=519.89
corr(T,N)=519.89/[SD(T)SD(N)]=519.89/square root of (561671*.7427)= 0.8049404
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