\BeginKnitrBlock{exercise}\iffalse{-91-67-97-108-99-117-108-97-116-105-110-103-32-90-45-45-115-99-111-114-101-115-93-}\fi{}<div class="exercise"><span class="exercise" id="exr:unnamed-chunk-49"><strong>(\#exr:unnamed-chunk-49)  \iffalse (Calculating Z--scores) \fi{} </strong></span>Returning to the mystery 215 cm tall Martian from the previous exercise. Calcuate it's Z--scores with respect to our two models from site I and site II.  Which site do you think the Martian came from, and why?</div>\EndKnitrBlock{exercise}