Allied Mat130 Module 8 Check Your Understanding

Allied Mat130 Module 8 Check Your Understanding

Allied Mat130 Module 8 Check Your Understanding

Question Points

1. A run chart is a sequential plot of individual data values over time.

a. True

b. False

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2. Determine what bests completes the following definition: _____ variation is due to chance; it is the type of variation inherent in any process that is not capable of producing every good or service exactly the same way every time.

a. Unexplained

b. Assignable

c. Random

d. Explained

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3. A run chart for individual values is shown below. Does there appear to be a pattern suggesting that the process is not within statistical control? If so, describe the pattern.

a. Process appears to be out of statistical control. There is a cyclical pattern.

b. Process variation appears to be in statistical control.

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4. Examine the given run chart or control chart and determine whether the process if within statistical control. If it is not, identify which of the three out-of-statistical-control criteria apply.

a. Process appears to be out of statistical control. There is an upward shift. There are eight consecutive points below the centerline.

b. Process variation appears to be in statistical control.

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5. Determine what completes the following definition: _____ are data arranged according to some time sequence. They are measurements of a characteristic of goods or services that result from some combination of equipment, people, materials, methods, or conditions.

a. Process data

b. Progressive data

c. Statistical data

d. Timed data

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6. A control chart for R is shown below. Determine whether the process variation is within statistical control. If it is not, identify which of the three out-of-statistical-control criteria lead to rejection of statistically stable variation.

a. Process is out of statistical control. There is a downward trend.

b. Process variation appears to be in statistical control.

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7. Process data are data arranged according to some time sequence. They are measurements of a characteristic of goods or services that result from some combination of equipment, people, materials, methods, and conditions.

a. True

b. False

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8. A control chart for is shown below. Determine whether the process mean is within statistical control. If it is not, identify which of the three-out-of-control criteria lead to rejection of a statistically stable mean.

a. Process mean is within statistical control.

b. Process mean is not within statistical control. There are points above and below the control limits. There is a shift upward.

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9. Determine which of the following is not a condition that must be satisfied for a process to be statistically stable (or within statistical control):

a. It has only natural variation

b. It has no patterns

c. It has no cycles

d. It has unusual points

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10. A control chart for is shown below. Determine whether the process mean is within statistical control. If it is not, identify which of the three-out-of-control criteria lead to rejection of a statistically stable mean.

a. Process mean is within statistical control.

b. Process mean is not within statistical control. There are points above and below the control limits. There is a cyclical pattern.

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11. A process is statistically stable if it has only natural variation, with no patterns, cycles, or any unusual points.

a. True

b. False

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12. Six Sigma represents reduced variation in a manufacturing process, which is the goal of statistical process control.

a. True

b. False

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13. Control charts have upper control limits and lower control limits found by processes similar to those for finding confidence intervals.

a. True

b. False

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14. A run chart for individual values is shown below. Does there appear to be a pattern suggesting that the process is not within statistical control? If so, describe the pattern.

a. Process appears to be out of statistical control. There are 8 consecutive points below the centerline, beginning around sample 8.

b. Process variation appears to be in statistical control.

15. Determine which of the following is not a requirement when constructing a control chart for p that can be used to determine whether the proportion of some attribute (such as whether products are defective) from process data is within statistical control.

a. The data are process data consisting of a sequence of samples all of the same size n.

b. Each sample item belongs to one of two categories.

c. The individual sample data values are independent.

d. The distribution of the process data is essentially normal.