Exam 3: Statistical Process Control

Consider a production process for a 5.0 oz. energy drink. A quality engineer has taken 15 samples each containing 6 energy drinks. The sum of the ranges of the energy drinks in the 15 samples is 12.68. The LCL for the control chart reporting variability within the samples is

Unique or special cause variation reflects the random variation associated with the output of a process.

The range is the difference between the smallest and largest values in a sample.

Control chart sample sizes are becoming smaller because it is easier to detect a pattern with Excel or other data analysis software.

Pizazz manufactures a 5.0 oz. energy drink of the same name. Because the cans are so small, consumers are concerned that they are not receiving the full 5 ounces in each can. A quality engineer at the company is charged with analyzing the filling process and ensuring accurate readings. On 15 different occasions over the past month, she has taken a sample of 6 energy drinks off the production line and recorded their weight. If the sum of the sample means is 80.20 ounces and the sum of the sample ranges is 12.68 ounces, the UCL for an R-chart of this process would be

Consider a production process that produces tires. A quality engineer has taken 15 samples, each containing 200 tires. The total number of defective tires over the 15 samples is 340. The sample standard deviation is

A control chart is in control when the plot of the sample points exhibits a pattern.

Consider a production process that produces tires. A quality engineer has taken 15 samples, each containing 200 tires. The total number of defective tires over the 15 samples is 340. The LCL for the control chat constructed using two sigma is

If the points plotted on a control chart display a pattern, it is called a run.

Attribute (qualitative) control charts are used to monitor descriptive characteristics of the output of a process rather than measurable characteristics.

The process capability index is used only for p and c charts while the process capability ratio is used only for ??xbar and R charts.

Process control charts are rarely useful for monitoring and controlling the output of service processes.

XYZ manufacturing has received an order to produce a rod 5 inches in diameter + .04 inch. In sample runs, the machine tool that will be making the rod has been able to produce rods with a mean diameter of 4.99 inches and a standard deviation of 0.011 inch. The process capability index for this process is

For a given process, the process capability ratio is not related to its specification limits.

59. A company randomly selects 100 light bulbs every day for 40 days from its production process. If 600 defective light bulbs are found in the sampled bulbs then the 3-sigma lower control limit would be

A p-chart is used to monitor the proportion defective in the output of a process.

Pizazz manufactures a 5.0 oz. energy drink of the same name. Because the cans are so small, consumers are concerned that they are not receiving the full 5 ounces in each can. A quality engineer at the company is charged with analyzing the filling process and ensuring accurate readings. On 15 different occasions over the past month, she has taken a sample of 6 energy drinks off the production line and recorded their weight. If the sum of the sample means is 80.20 ounces and the sum of the sample ranges is 12.68 ounces, what is the centerline of an R-chart for this process?

The range is the difference between the smallest and largest values in a sample.

Consider a production process for a 5.0 oz. energy drink. A quality engineer has taken 15 samples each containing 6 energy drinks. The sum of the ranges of the energy drinks in the 15 samples is 12.68. The UCL for the control chart reporting variability within the samples is

Statistical process control involves monitoring and controlling a process to prevent poor quality.