Question 1

What is the upper control limit for a c-chart if the total defects found over 200 samples equals 32?
A)1.36
B)13.75
C)0.56
D)25.00
E)48.97

Accepted Answer

(UCL = ? + Z?? = 32/200 + 3 * ?(32/200) = 1.36)

Question 2

Statistical quality control is a subset of statistical process control.

Accepted Answer

Statistical process control is a subset of statistical quality control, as statistical quality control encompasses a broader range of statistical methods to manage and improve quality, including statistical process control.

Question 3

The range of a data set is always non-negative.

Accepted Answer

The range of a data set is calculated by subtracting the smallest value from the largest value. Since the largest value must be greater than or equal to the smallest value, the range is always non-negative.

Question 4

Ritz-Carlton employees are empowered to spend up to how much money on the spot to correct any customer complaint?
A)$25
B)$50
C)$100
D)$1000
E)$2000

Accepted Answer

The answer of Ritz-Carlton employees are empowered to spend up...

Question 5

Each day for two workweeks (10 days total), George weighs 4 bags from that day's production. If the average of the means is 14 oz. and the average range is 0.4 oz., what is the lower control limit for an x-bar chart for this process?
A)13.7084 oz.
B)13.8768 oz.
C)14.2916 oz.
D)12.8000 oz.
E)13.5908 oz.

Accepted Answer

(LCL = x-bar - A_2*R-bar = 14 - .73*.4 = 13.708)

Question 6

What is the only service company to have won the Malcolm Baldrige National Quality Award twice?
A)Marriott
B)Nordstrom Department Stores
C)Wal-Mart
D)Ritz-Carlton
E)Northwest Airlines

Accepted Answer

The Ritz-Carlton is the only service company to have won the Malcolm Baldrige National Quality Award twice, in 1992 and 1999.

Question 7

The standard deviation measures the difference between the largest and smallest observations in a set of data.

Accepted Answer

The standard deviation measures the spread or dispersion of the data around the mean, not the difference between the largest and smallest observations.

Question 8

Suppose that you have calculated the control limits for a p-chart to be the following: LCL = 0.02 and UCL = 0.08.
Today, you took 10 samples of 20 units each. The first nine samples each had one defect. The last sample had zero defects. What can you conclude?
A)the process is out of control
B)the process is in a state of control
C)the last sample should be ignored because it was "too good"
D)you calculated the limits incorrectly because the LCL must be either negative or 0
E)the sample size must be increased

Accepted Answer

The answer of Suppose that you have calculated the control...

Question 9

Suppose that you want to monitor the variability in ounces of a process that fills beer cans. Which control chart would be appropriate?
A)x-bar chart
B)R-chart
C)p-chart
D)c-chart
E)OC chart

Accepted Answer

An R-chart (range chart) is appropriate for monitoring variability or dispersion in a process. It tracks the difference between the highest and lowest values in a sample of data. This is useful for ensuring consistency in the filling process and making sure the cans are all filled with the same amount of beer. The x-bar chart (A) is used to monitor the central tendency or average of a process. The p-chart (C) is used to monitor the proportion of defective items in a process. The c-chart (D) is used to monitor the number of defects per item in a process. The OC chart (E) is not a commonly used control chart.

Question 10

If the upper control limit for a c-chart is 28 and the lower control limit is 4, what is the average number of defects per sample?
A)16
B)12
C) 5.29
D) 7.29
E) 4

Accepted Answer

(?= (UCL-LCL)/2 + LCL = (28-4)/2 + 4 = 16)

Question 11

What is the upper control limit for a c-chart if the total defects found over 20 samples equals 150?
A)7.5
B)2.739
C)15.72
D)20
E)30

Accepted Answer

(UCL = ? + Z?? = 150/20 + 3 * ?(150/20) = 15.72)

Question 12

What program at Intel enforces the policy to make chips in the same way at all facilities?
A)"make-same"
B)"copy-exactly"
C)"duplicate-same"
D)"duplicate-exactly"
E)"one-size-fits-all"

Accepted Answer

The "copy-exactly" program at Intel ensures that chips are manufactured in the same way across all of its facilities, maintaining consistency and quality in production.

Question 13

Suppose that you want to monitor the average ounces of a process that fills beer cans. Which control chart would be appropriate?
A)x-bar chart
B)R-chart
C)p-chart
D)c-chart
E)OC chart

Accepted Answer

The appropriate control chart for monitoring the average ounces of a process that fills beer cans is the x-bar chart, which tracks the mean of a sample of data. This is because the process output (i.e. the amount of beer in each can) is continuous data and can be measured quantitatively. The x-bar chart allows us to monitor shifts in the process mean over time, which can help identify if the process is out of control and needs corrective action.

Question 14

Descriptive statistics are used to describe quality characteristics and relationships.

Accepted Answer

Descriptive statistics include measures such as mean, median, and standard deviation, which provide information about the central tendency and variability of a dataset. They are used to describe the characteristics of a dataset, such as its distribution and shape, and to explore relationships between variables.

Question 15

Suppose that Matt wants to use a process control chart to monitor the number of different types of mistakes that he makes when giving motivational speeches to student groups. Which control chart would be most appropriate?
A)x-bar chart
B)R-chart
C)p-chart
D)c-chart
E)OC chart

Accepted Answer

The answer of Suppose that Matt wants to use a...

Question 16

Which of the following is the least important point to perform inspection?
A)Incoming materials
B)Prior to costly processing
C)Just after costly processing
D)Prior to bottleneck (limited machine capacity)processing
E)After the product is finished

Accepted Answer

The answer of Which of the following is the least...

Question 17

An important task in quality control is to find out the range of natural random variation in a process.

Accepted Answer

This statement is true. Understanding the range of natural random variation in a process is crucial in identifying when the process begins to deviate from its normal state, indicating the presence of an issue that needs to be addressed through corrective action.

Question 18

Suppose that you want to measure the percentage of candles that are cut longer than 9 inches. Which control chart would be appropriate?
A)x-bar chart
B)R-chart
C)p-chart
D)c-chart
E)OC chart

Accepted Answer

Since we are measuring the percentage of candles that are longer than 9 inches, which is a proportion, the appropriate control chart is a p-chart.

Question 19

Acceptance sampling occurs after the product has been produced.

Accepted Answer

Acceptance sampling is a process of inspecting a sample of finished products and determining whether they meet a specified quality standard. This inspection happens after the product has been produced.

Question 20

What is the lower control limit for a c-chart if the average number of defects found over 320 samples is equal to 16?
A)6.584
B)4
C)20
D)0
E)12

Accepted Answer

(LCL = ? - Z?? = 16 + 3 * ?(16) = 4)

Quiz 6: Statistical Quality Control

What is the upper control limit for a c-chart if the total defects found over 200 samples equals 32?

Statistical quality control is a subset of statistical process control.

The range of a data set is always non-negative.

Ritz-Carlton employees are empowered to spend up to how much money on the spot to correct any customer complaint?

Each day for two workweeks (10 days total) , George weighs 4 bags from that day's production. If the average of the means is 14 oz. and the average range is 0.4 oz., what is the lower control limit for an x-bar chart for this process?

What is the only service company to have won the Malcolm Baldrige National Quality Award twice?

The standard deviation measures the difference between the largest and smallest observations in a set of data.

Suppose that you have calculated the control limits for a p-chart to be the following: LCL = 0.02 and UCL = 0.08. Today, you took 10 samples of 20 units each. The first nine samples each had one defect. The last sample had zero defects. What can you conclude?

Suppose that you want to monitor the variability in ounces of a process that fills beer cans. Which control chart would be appropriate?

If the upper control limit for a c-chart is 28 and the lower control limit is 4, what is the average number of defects per sample?

What is the upper control limit for a c-chart if the total defects found over 20 samples equals 150?

What program at Intel enforces the policy to make chips in the same way at all facilities?

Suppose that you want to monitor the average ounces of a process that fills beer cans. Which control chart would be appropriate?

Descriptive statistics are used to describe quality characteristics and relationships.

Suppose that Matt wants to use a process control chart to monitor the number of different types of mistakes that he makes when giving motivational speeches to student groups. Which control chart would be most appropriate?

Which of the following is the least important point to perform inspection?

An important task in quality control is to find out the range of natural random variation in a process.

Suppose that you want to measure the percentage of candles that are cut longer than 9 inches. Which control chart would be appropriate?

Acceptance sampling occurs after the product has been produced.

What is the lower control limit for a c-chart if the average number of defects found over 320 samples is equal to 16?