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Exam 14: Statistical Process Control

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Question 31

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Examine the given run chart or control chart and determine whether the process is within statistical control.

A) The process is within statistical control.
B) The process is not within statistical control.

C) A) and B)
D) undefined

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Question 32

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The centerline for a control chart for R consists of _______________.

A) the mean of the sample ranges
B) the mean of the sample data
C) the median
D) the standard deviation

E) B) and C)
F) A) and C)

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Question 33

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Which type of chart does not have control limits?

__________________ variation results from causes that can be identified.

Which type of chart would be best for monitoring the proportion of items that are defective?

Describe the three criteria used to determine if a control chart indicates a process which is not statistically stable.

Which of the following is not one of the criteria for determining if a control chart indicates that a process is not statistically stable?

Examine the given run chart or control chart and determine whether the process is within statistical control.

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

Construct an $\bar { x }$ chart and determine whether the process variation is within statistical control. A machine that is supposed to produce ball bearings with a diameter of 7 millimeters yields the following data from a test of 5 ball bearings every 20 minutes.

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-control criteria lead to rejection of statistically stable variation.

Use the given process data to construct a control chart for p. If the weight of cereal in a particular packet is less than 14 ounces, the packet is considered nonconforming. Each week, the manufacturer randomly selects 1,000 cereal packets and determines the number that are nonconforming. The results for 12 consecutive weeks are shown below. $\begin{array} { l l l l l l l l l l l l } 46 & 32 & 21 & 30 & 47 & 31 & 32 & 52 & 48 & 45 & 62 & 58\end{array}$

A control chart for $\bar { x }$ 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.

Describe the three criteria used to determine if a control chart indicates a process which is not statistically stable.

Use the given process data to construct a control chart for p. A candy manufacturer considers a cracked piece of candy to be a defect. Each day 100 candies are randomly selected and checked for cracks. The numbers of defects for 20 consecutive days are given below. $\begin{array} { l l l l l l l l l l l l l l l l l l l l } 14 & 4 & 5 & 5 & 5 & 5 & 5 & 6 & 6 & 6 & 6 & 12 & 6 & 6 & 6 & 7 & 6 & 7 & 8 & 7\end{array}$ What is the value of the center line?

Examine the given run chart or control chart and determine whether the process is within statistical control. If it is not, identity which of the three out-of-statistical-control criteria apply. A run chart for individual values W is shown below. Does there appear to be a pattern suggesting that the process is not within statistical control? If so, describe the pattern.

Sketch a control chart that indicates that a process is not statistically stable due to the run of 8 rule.

Provide an appropriate response. A common goal of quality control is to reduce variation in a product or service. List and describe the two types of variability. Give an example of each.

Describe a run chart and give an example. Refer to the values on each of the axes as you describe the run chart.

A common goal of quality control is to reduce variation in a product or service. List and describe the two types of variability. Give an example of each.