The Goodman Tire and Rubber Company periodically tests its tires for tread wear under simulated road… 1 answer below »

The Goodman Tire and Rubber Company periodically tests its tires for tread wear under simulated road conditions. To study and control the manufacturing process, 20 samples, each containing three radial tires, were chosen from different shifts over several days of operation; the data collected are shown below. Assuming that these data were collected when the manufacturing process was believed to be operating in control, develop theRand x¯ charts.

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Sample

 

Tread Wear*

 

1

31

42

28

2

26

18

35

3

25

30

34

4

17

25

21

5

38

29

35

6

41

42

36

7

21

17

29

8

32

26

28

9

41

34

33

10

29

17

30

11

26

31

40

12

23

19

25

13

17

24

32

14

43

35

17

15

18

25

29

16

30

42

31

17

28

36

32

18

40

29

31

19

18

29

28

20

22

34

26

*Hundredths of an inch