\BeginKnitrBlock{exercise}\iffalse{-91-73-110-102-108-117-101-110-99-101-114-115-32-111-102-32-112-111-119-101-114-93-}\fi{}<div class="exercise"><span class="exercise" id="exr:unnamed-chunk-85"><strong>(\#exr:unnamed-chunk-85)  \iffalse (Influencers of power) \fi{} </strong></span>Given that the sample size influences power via the $SEM$, can you derive how population variance influences power?</div>\EndKnitrBlock{exercise}