Month	KwH	KwH (wrong)
	10/07/08	5628	5628
	11/07/08	5293	5293
	12/07/08	6042	6042
	01/08/08	NA	0
	02/08/08	9708	9708
	03/08/08	5191	5191
	04/08/08	5930	5930
	05/08/08	4582	4582
	06/08/08	5262	5262
	07/08/08	3857	3857
	08/08/08	5013	5013
	09/08/08	5118	5118
	correct	n = 12 (wrong)	Jan = 0 (wrong)
	points
	3	2	1
1	ratio	ratio	ratio	Level of measurement
2	11	12	12	Sample size
3	5602.18	5602.18	5135.33	Sample mean
4	11	12	12	Sample size
5	1490.22	1490.22	2152.73	Sample standard deviation
6	5602.18	5602.18	5135.33	Point estimate
7	10	11	11	Degrees of Freedom
8	2.23	2.2	2.2	Tcritical
9	449.32	430.19	621.44	Standard error
10	1001.15	946.84	1367.78	Margin of error
11	4601.04	4655.34	3767.55	Lower bound 95% confidence
	6603.33	6549.03	6503.11	Upper bound 95% confidence
12	0.05	0.05	0.05	Alpha α
13	No	No	No	Stat sig difference µ = 6094.33?
14	fail to reject	fail to reject	fail to reject	Hypothesis status?
15	No	No	No	Energy saved?
	-1.1	-1.14	-1.54	t-statistic
	0.3	0.28	0.15	p-value
	0.7	0.72	0.85	max c