p488		region I	region II
	n	16	15
	mean	4.75	3.93
	stdev	2.82	2.43
	mean difference	0.82
	Ho: µ1-µ2=0
	Ho: µ1-µ2<>0
Hyp	pooled 1/√n	0.3594
Test	degrees freedom	29
	pooled s	2.6389
	t-statistic t	0.8646
	t critical tc	2.0452
	p-value	0.3944
	max c	0.6056
Conf	Error E	1.9397
Int	mean diff – E	-1.1197
	mean diff	0.8200
	mean diff + E	2.7597
	CI includes zero: Zero cannot be
	ruled out as a possible pop value