Top Billers processes bills for customers. Lately, they have been getting complaints of errors in the bills they have processed. Bills can contain errors resulting from a number of causes, such as incorrect amounts, wrong dates, wrong customer information, etc. The quality manager for Top Billers decides to sample one customer’s batch of bills per day to determine the number and proportion of errors. Use a u-chart to analyze the data found in the table in the worksheet Prob07-09 in the Ch07Data.xlsx file.

 

Top Billers
Average Number of Nonconformances Per Unit (u) Chart
This spreadsheet is designed for up to 75 samples. Enter data ONLY in yellow-shaded cells.
Click on the sheet tab to display the control chart (some rescaling may be needed).
Average (u-bar)		0.01406
		Sample
	Number of	Unit	Defects	Standard
Sample	Nonconformances	Size	per unit	Deviation	LCLu	CL	UCLu
1	2	171	0.0117	0.00907	0	0.0141	0.0413			2	171
2	1	194	0.0052	0.00851	0	0.0141	0.0396			1	194
3	1	121	0.0083	0.01078	0	0.0141	0.0464			1	121
4	3	200	0.0150	0.00839	0	0.0141	0.0392			3	200
5	1	159	0.0063	0.00940	0	0.0141	0.0423			1	159
6	3	162	0.0185	0.00932	0	0.0141	0.0420			3	162
7	4	186	0.0215	0.00870	0	0.0141	0.0402			4	186
8	1	182	0.0055	0.00879	0	0.0141	0.0404			1	182
9	2	155	0.0129	0.00953	0	0.0141	0.0426			2	155
10	2	185	0.0108	0.00872	0	0.0141	0.0402			2	185
11	1	179	0.0056	0.00886	0	0.0141	0.0407			1	179
12	3	160	0.0188	0.00938	0	0.0141	0.0422			3	160
13	1	159	0.0063	0.00940	0	0.0141	0.0423			1	159
14	1	154	0.0065	0.00956	0	0.0141	0.0427			1	154
15	7	151	0.0464	0.00965	0	0.0141	0.0430			7	151
16	5	169	0.0296	0.00912	0	0.0141	0.0414			5	169
17	3	189	0.0159	0.00863	0	0.0141	0.0399			3	189
18	4	178	0.0225	0.00889	0	0.0141	0.0407			4	178
19	2	161	0.0124	0.00935	0	0.0141	0.0421			2	161
20	1	198	0.0051	0.00843	0	0.0141	0.0393			1	198
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22			#N/A	#N/A	#N/A	#N/A	#N/A		SUM =	48	3413
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46			#N/A	#N/A	#N/A	#N/A	#N/A			Fantastic news! We've Found the answer you've been seeking! Answer rating: 100% (2 reviews) The uchart shows what the rate of errors was based on the bills processed with a varia...View the full answer Answered By Fahmin Arakkal Tutoring and Contributing expert question and answers to teachers and students. Primarily oversees the Heat and Mass Transfer contents presented on websites and blogs. Responsible for Creating, Editing, Updating all contents related Chemical Engineering in latex language 4.40+ 8+ Reviews 22+ Question Solved Related Book For   An Introduction To Six Sigma And Process Improvement ISBN: 9781133604587 2nd Edition Authors: James R. Evans, William M. Lindsay See More Books Question Posted: Jul 06, 2023 03:02 AM See More Questions Students also viewed these Business questions A certain manufacturing plant is having problems meeting its delivery commitments. 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