A) Are used for the fraction of non-conforming items B) Count the number of nonconformances per unit C) Use continuous metrics D) Can have negative lower limits A) Are used for the fraction of non-conforming items B) Count the number of nonconformances per unit C) Use continuous metrics D) Can have negative lower limits

Exam 16: Quality Control and Spc

The center line (p-bar) for a p-chart is 0.50 with an UCL = 0.70 and a LCL = 0.35.The results of the next eight sample means are 0.45, 0.60, 0.39, 0.44, 0.48, 0.53, 0.54, and 0.61.What would you do?

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Question 1

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A Procter and Gamble factory process fills boxes with detergent.Construct an appropriate set of control charts to monitor the process.Historical data for fill weight (in ounces) of eight samples is presented below.A sample size of six was used. a.Compute the limits for both an R chart and x-bar chart.Compare the sample results to the limits of the charts. b.Briefly explain what the quality control charts tell you.What actions, if any, would you take?

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a.UCL_R = (2.004)(.305) = 0.611
LCL_R = (0)(.305) = 0
n = 6 ; R-bar = 2.44/8 = 0.305
x-bar = 128.24/8 = 16.03
R chart is in control
UCL_X = 16.03 + (0.483)(.305) = 16.18
LCL_X= 15.88
b.R-bar chart is stable and in control but x-bar chart is not in SPC.Stop the process and investigate sources (root causes) of error.

Define and give an example of the three components of any control system.

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Question 3

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The three components of any control system are:
1. A performance standard or goal
2. A means of measuring actual performance
3. Comparison of actual performance with the standard to form the basis for corrective action
Many examples can be provided, such as driving, taking an exam, keeping an inventory of milk in your refrigerator, and so on.

If the mean in the range chart shifts down significantly, it indicates that the variation in the process has decreased.

(True/False)

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Question 4

p-charts

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Question 5

As long as no points are outside of the control limits in a control chart, the process would be considered to be in control

(True/False)

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Question 6

Special cause variation tends to be easily detectable using statistical methods.

(True/False)

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Question 7

In manufacturing, quality control is generally applied at the receiving stage from suppliers, during various production processes, and at the finished goods stage.

(True/False)

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Question 8

Find the control limits for a c chart with $\overline{c}$ = 7.

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Question 9

Which of the following is not related to a continuous metric?

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Question 10

Regarding special cause variability, all are true except

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Question 11

If process quality approaches six sigma levels, then standard types of control charts are not useful.

(True/False)

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Question 12

A system governed only by common causes is called a stable system.

(True/False)

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Question 13

An operator has determined what her percent defectives is for the machine which she operates.Based on several samples of 75 observations, she found p-bar to be 10%.She wants to set up a control chart using 3 standard deviation control limits. a.What is the upper control limit for a p chart? b.What is the lower control limit for a p chart?

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Question 14

Over-adjusting a process that is in control will usually increase the variation in the output.

(True/False)

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Question 15

Quality at the source means that quality is controlled by

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Question 16

A process is considered to be in control when all common and special causes have been eliminated.

(True/False)

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Question 17

A bottling process sometimes results in overfills or underfills.Overfills are especially damaging to the equipment.Which process capability index would this company most want to monitor?

(Multiple Choice)

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Question 18

Flaws are counted on a standard steel plate (sheet).Each sheet has the exact same dimensions.Ten sheets are selected at random and the number of flaws per sheet is as follows. Determine the lower and upper control limits for a c chart..

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Question 19

A key element of a control system is the ability to measure performance and compare it to a performance standard.

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Question 20

Showing 1 - 20 of 85

Exam 16: Quality Control and Spc

The center line (p-bar) for a p-chart is 0.50 with an UCL = 0.70 and a LCL = 0.35.The results of the next eight sample means are 0.45, 0.60, 0.39, 0.44, 0.48, 0.53, 0.54, and 0.61.What would you do?

Define and give an example of the three components of any control system.

If the mean in the range chart shifts down significantly, it indicates that the variation in the process has decreased.

p-charts

As long as no points are outside of the control limits in a control chart, the process would be considered to be in control

Special cause variation tends to be easily detectable using statistical methods.

In manufacturing, quality control is generally applied at the receiving stage from suppliers, during various production processes, and at the finished goods stage.

Find the control limits for a c chart with c‾\overline{c}c = 7.

Which of the following is not related to a continuous metric?

Regarding special cause variability, all are true except

If process quality approaches six sigma levels, then standard types of control charts are not useful.

A system governed only by common causes is called a stable system.

Over-adjusting a process that is in control will usually increase the variation in the output.

Quality at the source means that quality is controlled by

A process is considered to be in control when all common and special causes have been eliminated.

A bottling process sometimes results in overfills or underfills.Overfills are especially damaging to the equipment.Which process capability index would this company most want to monitor?

Flaws are counted on a standard steel plate (sheet).Each sheet has the exact same dimensions.Ten sheets are selected at random and the number of flaws per sheet is as follows. Determine the lower and upper control limits for a c chart..

A key element of a control system is the ability to measure performance and compare it to a performance standard.

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Find the control limits for a c chart with $\overline{c}$ = 7.