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Create statistical control chart

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Reference no: EM133262656

Plastic keychains are being manufactured at a company called Hot Shot Plastics. Plastic material is printed first and then trimmed according to the desired shape. The cure time (ie the time for the plastic to cool) during the printing process affects the quality of the resulting keychain edge. The cure time data already exists and is given below.

Based on these data:

1. Create statistical control chart

2. Analyze the graph and comment on whether the process appears controlled and stable.

3. There are Twelve additional cure time data from the printing process collected from the actual production process. The data from this new sample is shown below. Update your control graph and compare the results with previous data. Comment on what the new chart shows.

No.

ct1

ct2

ct3

ct4

1

27.34667

27.50085

29.94412

28.21249

2

27.79695

26.15006

31.21295

31.33272

3

33.53255

29.32971

29.7046

31.053

4

37.98409

32.26942

31.91741

29.44279

5

33.82722

30.32543

28.38117

33.70124

6

29.68356

29.56677

27.23077

34.00417

7

32.6264

26.3203

32.07892

36.17198

8

30.29575

30.52868

24.43315

26.85241

9

28.43856

30.48251

32.43083

30.76162

10

28.2779

33.94916

30.47406

28.87447

11

26.91885

27.66133

31.46936

29.66928

12

28.46547

28.29937

28.99441

31.14511

13

32.42677

26.1041

29.47718

37.20079

14

28.84273

30.51801

32.23614

30.47104

15

30.75136

32.99922

28.08452

26.19981

16

31.25754

24.29473

35.46477

28.41126

17

31.24921

28.57954

35.00865

31.23591

18

31.41554

35.80049

33.60909

27.82131

19

32.2023

32.02005

32.71018

29.3762

20

26.91603

29.77775

33.92696

33.78366

21

35.05322

32.93284

31.51641

27.73615

22

32.12483

29.32853

30.99709

31.39641

23

30.09172

32.43938

27.84725

30.70726

24

30.04835

27.23709

22.01801

28.69624

25

29.30273

30.83735

30.82735

31.90733

25

29.30273

30.83735

30.82735

31.90733

No.

ct1

ct2

ct3

ct4

1

31.6583

29.7833

31.8791

33.9125

2

34.4643

25.1848

37.76689

39.21143

3

41.34268

39.5459

29.5571

32.5735

4

29.4731

25.3784

25.0438

24.0035

5

25.4671

34.8516

30.1915

31.6222

6

46.25184

34.71356

41.41277

44.63319

7

35.4475

38.83289

33.0886

31.6349

8

34.55143

33.8633

35.18869

42.31515

9

43.43549

37.36371

38.85718

39.25132

10

37.05298

42.47056

35.90282

38.21905

11

38.57292

39.06772

32.2209

33.202

12

27.0305

33.6397

26.6306

42.79176

Reference no: EM133262656

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