Chapter 15 Statistical Quality Control

Given the sample results (100 units in each sample):

53) Based on Table 15-2, find the 95.5% lower limit of the appropriate p-chart.

A) 0.0076

B) 0.0964

C) 0.2014

D) 0.1397

E) None of the above

54) The c-chart is useful when we

A) take a number of measurements and compute the average.

B) take a number of measurements and compute the ranges.

C) find the fraction of the production lot defective.

D) find the number of defective items in a production lot.

E) None of the above

55) A company has been receiving complaints about the attitude of some sales clerks. Over a 10-day period, the total number of complaints was 360. The company wishes to develop a control chart for the number of complaints. What would the upper control limit on the number of complaints per day be for a 3 sigma (99.7%) control chart?

A) 18

B) 36

C) 42

D) 54

E) None of the above

56) A company has been receiving complaints about the attitude of some sales clerks. Over a 10-day period, the total number of complaints was 360. The company wishes to develop a control chart for the number of complaints. What would the upper control limit on the number of complaints per day be for a 2 sigma (95.5%) control chart?

A) 12

B) 42

C) 48

D) 54

E) None of the above

57) A company has been receiving complaints about the attitude of some sales clerks. Over a 10-day period, the total number of complaints was 250. The company wishes to develop a control chart for the number of complaints. What would the lower control limit on the number of complaints per day be for a 3 sigma (99.7%) control chart?

A) 20

B) 0

C) 15

D) 10

E) 202.6

58) A company has been receiving complaints about the attitude of some sales clerks. Over a 10-day period, the total number of complaints was 250. The company wishes to develop a control chart for the number of complaints. What would the lower control limit on the number of complaints per day be for a 2 sigma (95.5%) control chart?

A) 20

B) 0

C) 15

D) 10

E) 202.6

59) A company has been receiving complaints about the attitude of some sales clerks. Over a 10-day period, the total number of complaints was 250. The company wishes to develop a control chart for the number of complaints. What would the upper control limit on the number of complaints per day be for a 2 sigma (95.5%) control chart?

A) 35

B) 40

C) 50

D) 200

E) None of the above

60) Technically, to achieve Six Sigma quality, there would have to be fewer than ________ defects per million opportunities.

A) 6

B) 166,667

C) 667

D) 67

E) 3.4

61) A company is producing cylindrical blocks for a children's toy. The average diameter of a block is 3.5 inches. Sixteen blocks are inspected and the diameters are measured. The standard deviation is estimated to be 0.02 inches. What are the 99.7% upper and lower control limits for the x-bar chart?

62) A coffee company is attempting to make certain that all its packaged coffee beans contain the same amount of coffee bean by weight. Over the last few days, it has taken several samples. The overall average weight of the sampled packages is 16 ounces, with an average range of 4 ounces. Each sample was of five packages. What would be the 99.7 upper and lower control limits for an-chart?