The Road King Tire Company in Birmingham wants to monitor the quality of the tires it manufactures. Each day the company quality-control manager takes a sample of 100 tires, tests them, and determines the number of defective tires. The results of 20 samples have been recorded as follows: Sample Number of Defectives Sample Number of Defectives  1 14 11 18  2 12 12 10  3  9 13 19  4 10 14 20  5 11 15 17  6  7 16 18  7  8 17 18  8 14 18 22  9 16 19 24 10 17 20 23   Construct a P -chart for this process using 2q limits and describe the variation in the process.

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The Road King Tire Company in Birmingham wants to monitor the quality of the tires it manufactures. Each day the company quality-control manager takes a sample of 100 tires, tests them, and determines the number of defective tires. The results of 20 samples have been recorded as follows:

Sample

Number of Defectives

Sample

Number of Defectives

 1

14

11

18

 2

12

12

10

 3

 9

13

19

 4

10

14

20

 5

11

15

17

 6

 7

16

18

 7

 8

17

18

 8

14

18

22

 9

16

19

24

10

17

20

23

 

Construct a P -chart for this process using 2q limits and describe the variation in the process.

 

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