SpeedyNetService.com, an Internet service provider (ISP), is concerned that the level of access for customers is decreasing, as a result of heavier use. The proportion of peak period time when a customer’s download speed drops by 20 percent or more below the average time is considered a good measure of service level. The percentage of time a customer experiences such drops during peak periods varies. Using a sampling process, the ISP set up control charts to monitor the service level, based on proportion of below average download speed during peak periods. Construct the p-chart using the sample data in the table in the worksheet Prob07-07 in the Ch07Data.xlsx file on the Student Companion Site for this chapter. What does the chart show? Is the service level based on the p-chart data good or bad, in your opinion?

 

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SpeedyNetService.com
Fraction Nonconforming (p) Chart
This spreadsheet is designed for up to 50 samples. Enter data ONLY in yellow-shaded cells.
Click on the sheet tab to display the control chart (some rescaling may be needed).
Average (p-bar)		0.0128
Avg. sample size		525.167
									Approximate Control Limits Using
		Sample	Fraction	Standard					Average Sample Size Calculations
Sample	Value	Size	Nonconforming	Deviation	LCLp	CL	UCLp		LCLp	CL	UCLp
1	8	492	0.0163	0.0051	0	0.013	0.0280		0	0.0128	0.0275
2	9	424	0.0212	0.0055	0	0.013	0.0292		0	0.0128	0.0275
3	4	508	0.0079	0.0050	0	0.013	0.0278		0	0.0128	0.0275
4	5	614	0.0081	0.0045	0	0.013	0.0264		0	0.0128	0.0275
5	11	566	0.0194	0.0047	0	0.013	0.0270		0	0.0128	0.0275
6	6	616	0.0097	0.0045	0	0.013	0.0264		0	0.0128	0.0275
7	5	528	0.0095	0.0049	0	0.013	0.0275		0	0.0128	0.0275
8	8	382	0.0209	0.0058	0	0.013	0.0301		0	0.0128	0.0275
9	8	608	0.0132	0.0046	0	0.013	0.0265		0	0.0128	0.0275
10	5	506	0.0099	0.0050	0	0.013	0.0278		0	0.0128	0.0275
11	3	596	0.0050	0.0046	0	0.013	0.0266		0	0.0128	0.0275
12	9	510	0.0176	0.0050	0	0.013	0.0278		0	0.0128	0.0275
13	11	428	0.0257	0.0054	0	0.013	0.0291		0	0.0128	0.0275
14	8	524	0.0153	0.0049	0	0.013	0.0276		0	0.0128	0.0275
15	3	410	0.0073	0.0056	0	0.013	0.0295		0	0.0128	0.0275
16	9	586	0.0154	0.0046	0	0.013	0.0268		0	0.0128	0.0275
17	8	488	0.0164	0.0051	0	0.013	0.0281		0	0.0128	0.0275
18	3	618	0.0049	0.0045	0	0.013	0.0264		0	0.0128	0.0275
19	9	552	0.0163	0.0048	0	0.013	0.0272		0	0.0128	0.0275
20	10	466	0.0215	0.0052	0	0.013	0.0285		0	0.0128	0.0275
21	6	472	0.0127	0.0052	0	0.013	0.0284		0	0.0128	0.0275
22	2	484	0.0041	0.0051	0	0.013	0.0282		0	0.0128	0.0275
23	8	468	0.0171	0.0052	0	0.013	0.0284		0	0.0128	0.0275
24	8	574	0.0139	0.0047	0	0.013	0.0269		0	0.0128	0.0275
25	7	606	0.0116	0.0046	0	0.013	0.0265		0	0.0128	0.0275
26	7	620	0.0113	0.0045	0	0.013	0.0264		0	0.0128	0.0275
27	5	575	0.0087	0.0047	0	0.013	0.0269		0	0.0128	0.0275
28	8	600	0.0133	0.0046	0	0.013	0.0266		0	0.0128	0.0275
29	5	541	0.0092	0.0048	0	0.013	0.0273		0	0.0128	0.0275
30	4	393	0.0102	0.0057	0	0.013	0.0298		0	0.0128	0.0275
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