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w6_template.xlsx

Question 1

day	# errors	proportion of errors
1	4	0.2
2	2	0.1
3	0	0
4	5	0.25
5	2	0.1
6	0	0
7	1	0.05
8	0	0
9	5	0.25
10	1	0.05
11	4	0.2
12	2	0.1
13	0	0
14	5	0.25
15	3	0.15
16	0	0
17	5	0.25
18	2	0.1
19	1	0.05
20	0	0
n		20.0000
days		20.0000
p-bar		0.105
sigma		0.0685474288	Sigma = sqrt (p-bar * (1- p-bar))/n)
3 * sigma		0.2056422865
UCL		0.3106422865	pbar + (3*sigma)
LCL		0	< --- Cant have less than zero instances of errors
Now - Graph this. Graph the proportion of errors, and make a horizontal line across the graph at 0.31 for the upper control limit. Make another horizontal line at 0 for the lower control limit. Do the proportion of errors for any of the days go outside of these two lines?