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WEST BATTERY DATA - BATTERY LIFETIMES (IN HOURS)

SAMPLE
Hour	1	2	3	4	5	_	R
1	51	50	49	50	50	50.0	2
2	45	47	70	46	36	48.8	34
3	50	35	48	39	47	43.8	15
4	55	70	50	30	51	51.2	40
5	49	38	64	36	47	46.8	28
6	59	62	40	54	64	55.8	24
7	36	33	49	48	56	44.4	23
8	50	67	53	43	40	50.6	27
9	44	52	46	47	44	46.6	8
10	70	45	50	47	41	50.6	29
11	57	54	62	45	36	50.8	26
12	56	54	47	42	62	52.2	20
13	40	70	58	45	44	51.4	30
14	52	58	40	52	46	49.6	18
15	57	42	52	58	59	53.6	17
16	62	49	42	33	55	48.2	29
17	40	39	49	59	48	47.0	20
18	64	50	42	57	50	52.6	22
19	58	53	52	48	50	52.2	10
20	60	50	41	41	50	48.4	19
21	52	47	48	58	40	49.0	18
22	55	40	56	49	45	49.0	16
23	47	48	50	50	48	48.6	3
24	50	50	49	51	51	50.2	2
25	51	50	51	51	62	53.0	12

With this sample in place, West now takes five more hours of data, shown in the following sample:

SAMPLE
Hour	1	2	3	4	5
26	41	52	39	57	61
27	45	53	41	46	66
21	63	49	50	45	53
29	57	70	45	52	61
30	45	31	46	54	52

a) Is the manufacturing process in control?

b) Comment on the lifetimes observed.

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