vote $A={}_0+{}_{1}prtystrA+{}_2$ expend $A+{}_3$ expend $B+{}_4$ expend $Ax$ expend $B+u$

$[$Model B$]$

Derive the partial effect of expendB on vote $A,$ holding prtystrA and expend A fixed, expressing your answer in terms of the population parameters and variables. $(4$ marks$)$

$q,$

$q,$

$q,$

$q,$

$q,$

$3$

$($b$)$ Estimate Model B and report the results, including the parameter estimates, standard errors of parameter estimates, number of observations and $R-$squared. $(4$ marks$)$

$($c$)$ Fix expendA at $300($or $$300,000).$ What is the estimated effect of another $$100,000$ spent by Candidate B on voteA? $(4$ marks$)$

$($d$)$ Model A and Model B $($can$/$cannot$)$ be compared based on $R$ squared or adjusted $R-$squared because $q,$

$q,$ Based on AIC, Model A is $\_($preferred$/$less preferred$)$ than Model B$.(2,4,2$ marks$)$

$q,$

$($d$)$ Model A and Model B $($can$/$cannot$)$ be compared based on $R-$

$($a$)$ Consider Model B:

vote $A={}_0+{}_1$ prtystrA $+{}_2$ expend $A+{}_3$ expend $B+{}_4$ expend $A$ expend $B+u$

$[$Model B$]$

Derive the partial effect of expendB on voteA, holding prtystrA and expendA fixed, expressing your answer in terms of the population parameters and variables. $(4$ marks$)$

$q,$

$q,$

$q,$

$q,$

$q,$

$3$

$($b$)$ Estimate Model B and report the results, including the parameter estimates, standard errors of parameter estimates, number of observations and $R-$squared. $(4$ marks$)$

$($c$)$ Fix expendA at $300($or $$300,000).$ What is the estimated effect of another $$100,000$ spent by Candidate B on voteA? $(4$ marks$)$

$($d$)$ Model A and Model B $($can$/$cannot$)$ be compared based on $R$ squared or adjusted $R-$squared because $q,$

$q,$

Based on AIC, Model A is

$($preferred$/$less preferred$)$ than Model B$.$

$(2,4,2$ marks$)$