Exam 19: Statistical Applications in Quality Management

SCENARIO 19-4 A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in seconds)is too erratic and adversely affects expected profits.The supervisor proceeds by randomly sampling 5 individuals per hour for a period of 10 hours.The sample mean and range for each hour are listed below. She also decides that lower and upper specification limit for the critical-to-quality variable should be 10 and 30 seconds,respectively. -Referring to Scenario 19-4,suppose the supervisor constructs an R chart to see if the variability in collection times is in-control.What are the lower and upper control limits for this R chart?

The CPL and CPU indexes are used to measure process' actual performance rather than its potential.

Mistake Proofing devices focus on methods that enable participants to reduce setup time for equipment and resources and materials needed for changeover.

SCENARIO 19-8 Recently,a university switched to a new type of computer-based registration.The registrar is concerned with the amount of time students are spending on the computer registering under the new system.She decides to randomly select 8 students on each of the 12 days of the registration and determine the time each spends on the computer registering.The range,mean,and standard deviation of the times required to register are in the table that follows. -Referring to Scenario 19-8,an R chart is to be constructed for the time required to register.The center line of this R chart is located at .

A process capability is estimated by the percentage of product or service that falls outside the specification limits.

Which of the following is a method for breaking process into a series of steps in order to eliminate defects and produce near perfect results?

SCENARIO 19-10 Below is the number of defective items from a production line over twenty consecutive morning shifts. -Referring to Scenario 19-10,a c chart is to be constructed for the number of defective items.The upper control limits is .

Which of the following is one of Deming's 14 points?

Total Productive Maintenance focuses on preventing the causes of defects.

The focus of Lean Six Sigma is on removing non-value added steps and waste which can exist in any part of an organization.

The Shewhart-Deming cycle plays an important role in which of the following Deming's 14 points for management?

SCENARIO 19-4 A factory supervisor is concerned that the time it takes workers to complete an important production task (measured in seconds)is too erratic and adversely affects expected profits.The supervisor proceeds by randomly sampling 5 individuals per hour for a period of 10 hours.The sample mean and range for each hour are listed below. She also decides that lower and upper specification limit for the critical-to-quality variable should be 10 and 30 seconds,respectively. -Referring to Scenario 19-4,what is the value of the C_pk index?

Common causes of variation represent variation due to the inherent variability in the system.

SCENARIO 19-3 A quality control analyst for a light bulb manufacturer is concerned that the time it takes to produce a batch of light bulbs is too erratic.Accordingly,the analyst randomly surveys 10 production periods each day for 14 days and records the sample mean and range for each day. -Referring to Scenario 19-3,suppose the analyst constructs an x̄ chart to see if the production process is in-control.What is the lower control limit (LCL)for this chart?

A capability index is used to measure the ability of a process to meet customer driven requirements.

Which famous statistician developed the 14 Points of Quality?

SCENARIO 19-3 A quality control analyst for a light bulb manufacturer is concerned that the time it takes to produce a batch of light bulbs is too erratic.Accordingly,the analyst randomly surveys 10 production periods each day for 14 days and records the sample mean and range for each day. -Referring to Scenario 19-3,suppose the sample mean and range data were based on 11 observations per day instead of 10.How would this change affect the lower and upper control limits of the R chart?

Which of the following is true regarding either instances or treatment of common cause variation?

SCENARIO 19-8 Recently,a university switched to a new type of computer-based registration.The registrar is concerned with the amount of time students are spending on the computer registering under the new system.She decides to randomly select 8 students on each of the 12 days of the registration and determine the time each spends on the computer registering.The range,mean,and standard deviation of the times required to register are in the table that follows. -Referring to Scenario 19-8,construct an R chart for the time required to register.

SCENARIO 19-9 The manufacturer of canned food constructed control charts and analyzed several quality characteristics.One characteristic of interest is the weight of the filled cans.The lower specification limit for weight is 2.95 pounds.The table below provides the range and mean of the weights of five cans tested every fifteen minutes during a day's production. -Referring to Scenario 19-9,an R chart is to be constructed for the weight.The center line of this R chart is located at .