Wilcoxon rank sum large sample example

A subject was taught using two different pedagogies. Sample of students from each method then wrote a common exam. These were the results:

Method A	70	90	82	64	86	77	84
	79	82	89	73	81	83	66
Method B	86	78	90	82	65	87
	80	88	95	85	76	94

No assumptions about the normality of the data were made. Is there any significant difference in average grades between the two pedagogies? Test at a 5% level of significance.

Here is the Megastat output:

Wilcoxon - Mann/Whitney Test
	n	sum of ranks
	12	190	Method B
	14	161	Method A
	26	351	total
		162.00	expected value
		19.44	standard deviation
		1.41	z
		.1572	p-value (two-tailed)

It should be noted that there is a bug in the Megastat macro. The correct Z value is (190 – 162)/19.44 = 1.44.