David	Vicki	z score	z critical	means test	F statistic	F critical	variances test
n =	38	40
mean =	0.181	0.177	0.95	1.00	not different
stdev =	0.017	0.020
variance=	0.0003	0.0004				1.43	1.51	not different
stderr =	0.003	0.003
CI =