Question $18(1$ point$)$

Consider the process $Y_t=10e_t+7e_{t-1}+4e_{t-2}+4e_{t-3}$ where

$e_t$ is a white noise process. Calculate the lag$-1$ autocorrelation,

${}_{t,t-1}=$Corr$(Y_t,Y_{t-1}).$

$($Provide your answer to two decimal places. Do not write correlation as a

percentage, i$.$e$.,$ do not write answers such as $83$ or $-67$ because these should be

$0\mathrm{.}83$ and $-0\mathrm{.}67.)$

Your Answer: