Exam 19: Statistical Applications in Quality Management Online

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 chart is to be used for the time required to register.The center line of this chart is located at __________.

The Cp index measures the potential of a process, not its actual performance.

Which of the following is not part of the DMAIC process in Six Sigma management?

CPL >1 implies that the process mean is more than 3 standard deviation away from the lower specification limit.

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

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, based on the chart, it appears that the process is in control.

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 limits 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 index?

SCENARIO 19-10 Below is the number of defective items from a production line over twenty consecutive morning shifts. -Referring to Scenario 19-10, the c chart suggests that the special cause of variation must be incorporated into the process to become part of the permanent ongoing process.

indicates that if the process average can be centered, then more than 99.73% of the observations will fall inside the specification limits.

Which of the following is not one of Deming's 14 points?

SCENARIO 19-7 A supplier of silicone sheets for producers of computer chips wants to evaluate her manufacturing process.She takes samples of size 5 from each day's output and counts the number of blemishes on each silicone sheet.The results from 20 days of such evaluations are presented below. She also decides that the upper specification limit is 10 blemishes. -Referring to Scenario 19-7, an R chart is to be constructed for the number of blemishes. The upper control limit for this data set is ________.

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

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 chart is to be used for the time required to register.One way to obtain the control limits is to take the grand mean and add and subtract the product of A2 times the mean of the sample ranges.For this data set, the value of A2 is ________.

A process is said to be out of control if

SCENARIO 19-7 A supplier of silicone sheets for producers of computer chips wants to evaluate her manufacturing process.She takes samples of size 5 from each day's output and counts the number of blemishes on each silicone sheet.The results from 20 days of such evaluations are presented below. She also decides that the upper specification limit is 10 blemishes. -Referring to Scenario 19-7, an chart is to be used for the number of blemishes.One way to obtain the control limits is to take the grand mean and add and subtract the product of times the mean of the sample ranges.For this data set, the value of is ________.

SCENARIO 19-7 A supplier of silicone sheets for producers of computer chips wants to evaluate her manufacturing process.She takes samples of size 5 from each day's output and counts the number of blemishes on each silicone sheet.The results from 20 days of such evaluations are presented below. She also decides that the upper specification limit is 10 blemishes. -Referring to Scenario 19-7, construct an R chart for the number of blemishes.

Variation due to the inherent variability in a system of operation is called

The principal focus of the control chart is the attempt to separate special or assignable causes of variation from common causes of variation.Which causes of variation can be reduced only by changing the system?

The SS method establishes ways to organize necessary housekeeping aspects of a work environment.

Developing operational definitions for each critical-to-quality characteristic involves which part of the DMAIC process?