The data processing department of the Arizona Bank has five data entry clerks. Each working day their supervisor verifies the accuracy of a random sample of 250 records. A record containing one or more errors is considered defective and must be redone. The results of the last 30 samples are shown in the table. All were checked to make sure that none was out of control. Sample Number of DefectiveRecords Sample Number of DefectiveRecords Sample Number of DefectiveRecords Sample Number of DefectiveRecords 1 2 3 4 5 6 7 8 7 5 19 10 11 8 12 9 9 10 11 12 13 14 15 16 6 13 18 5 16 4 11 8 17 18 19 20 21 22 23 12 4 6 11 17 12 6 24 25 26 27 28 29 30 Total 7 13 10 14 6 11 9 300 a. Based on these historical data, set up a p-chart using z = 3.b. Samples for the next 4 days showed the following: Sample Number of Defective Records Tues Wed Thurs Fri 17 15 22 21 What is the supervisor’s assessment of the data-entry process likely to be?
The data processing department of the Arizona Bank has five data entry clerks. Each working day their supervisor verifies the accuracy of a random sample of 250 records. A record containing one or more errors is considered defective and must be redone. The results of the last 30 samples are shown in the table. All were checked to make sure that none was out of control. Sample Number of DefectiveRecords Sample Number of DefectiveRecords Sample Number of DefectiveRecords Sample Number of DefectiveRecords 1 2 3 4 5 6 7 8 7 5 19 10 11 8 12 9 9 10 11 12 13 14 15 16 6 13 18 5 16 4 11 8 17 18 19 20 21 22 23 12 4 6 11 17 12 6 24 25 26 27 28 29 30 Total 7 13 10 14 6 11 9 300 a. Based on these historical data, set up a p-chart using z = 3.b. Samples for the next 4 days showed the following: Sample Number of Defective Records Tues Wed Thurs Fri 17 15 22 21 What is the supervisor’s assessment of the data-entry process likely to be?
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.4: Collecting Data
Problem 6E
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The data processing department of the Arizona Bank has five data entry clerks. Each working day their supervisor verifies the accuracy of a random sample of 250 records. A record containing one or more errors is considered defective and must be redone. The results of the last 30 samples are shown in the table. All were checked to make sure that none was out of control.
| Sample | Number of Defective Records |
Sample | Number of Defective Records |
Sample | Number of Defective Records |
Sample | Number of Defective Records |
|
1 2 3 4 5 6 7 8
|
7 5 19 10 11 8 12 9
|
9 10 11 12 13 14 15 16
|
6 13 18 5 16 4 11 8
|
17 18 19 20 21 22 23
|
12 4 6 11 17 12 6
|
24 25 26 27 28 29 30
Total |
7 13 10 14 6 11 9
300 |
a. Based on these historical data, set up a p-chart using z = 3.
b. Samples for the next 4 days showed the following:
| Sample | Number of Defective Records |
|
Tues Wed Thurs Fri |
17 15 22 21 |
What is the supervisor’s assessment of the data-entry process likely to be?
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