Which observation has the higher z-score? I : x= 136.3 ; x= 70.5 ; s= 15.3 II : x = 23.5 ; x= 11.7; s= 2.4 (a) I (b) II (c) neither (d) cannot be determined

Answer 1

z = (x-mean)/stnddev

(136.3 - 50.5)/15.3 =5.607

(23.5 - 11.7)/2.4 = 4.916