Suppose that the chest circumference of presumably normal newborn baby girls is normally distributed with =13.0 in and standard deviation =0.7 in. A group of 25 newborn girls, from a population living in a remote region is thought to perhaps constitute a genetic isolate, is studied and found to have an average chest circumference of 12.6 in. Is there evidence that the group of 25 come from a population with chest circumference different from 13.0 in this study the Z test = ???????? -2.85 X 0.0021 X 1.65 X 1.98