Archeologists have studied sizes of Egyptian skulls in an attempt to determine whether breeding occurred between different cultures. Listed below are the widths (mm) of skulls from 150 A.D. Construct a 90% confidence interval estimate of the mean skull width. 127.9 137.9 125.8 132.3 143.2 135.4 139.2 129.3 127.9 137.9 125.8 132.3 143.2 135.4 139.2 129.3.