1.

Construct three histograms (using 5 to 7 cell intervals) to represent the three data sets below.

2.

Draw in the specification limits below.

Upper spec

11

7.66

0.56

Target

10.75

7.55

0.55

Lower spec

10.5

7.45

0.54

3.

Answer each of the below questions for each histogram:

Note that the process has been designated as statistically stable from a previous study; a previous capability study has been run, and the results indicated an acceptable CpK of 1.67.

a. Is the process capable?

b. Is the process acceptable?

c. Is the process random (i.e., bell-shaped)?

d. Is the process centered?

e. What would you do considering your analysis of each of the three histograms?

Histogram Analysis
LengthWidthThickness

10.67

7.52

0.551

10.74

7.57

0.546

10.68

7.55

0.546

10.72

7.55

0.557

10.66

7.53

0.546

10.69

7.56

0.542

10.7

7.53

0.545

10.72

7.57

0.537

10.69

7.55

0.552

10.68

7.54

0.547

10.72

7.56

0.546

10.7

7.58

0.545

10.7

7.55

0.56

10.73

7.55

0.548

10.75

7.54

0.546

10.73

7.56

0.543

10.69

7.54

0.548

10.68

7.55

0.545

10.7

7.55

0.553

10.77

7.55

0.537

10.72

7.54

0.549

10.69

7.56

0.541

10.66

7.56

0.543

10.69

7.57

0.545

10.63

7.54

0.549

10.68

7.55

0.546

10.73

7.56

0.545

10.74

7.57

0.539

10.65

7.54

0.541

10.69

7.55

0.545

10.7

7.54

0.547

10.72

7.56

0.543

10.75

7.53

0.545

10.71

7.54

0.546

10.72

7.55

0.547