Question 1

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

Accepted Answer

This is true. Understanding natural random variation helps identify when a process is out of control or exhibiting abnormal behavior, which can help identify possible causes for defects or errors. It also helps establish control limits and process capability.

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

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 4

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 5

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

A c-chart is used for monitoring the number of defects or errors in a process, which is suitable for tracking the number of different types of mistakes in Matt's speeches.

Question 6

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 used to monitor the variability in a process; in this case, the variability in ounces of beer cans being filled. The R-chart measures the range of measurements within each subgroup, which is a good indicator of the variation in the process.

Question 7

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 8

Acceptance sampling occurs after the product has been produced.

Accepted Answer

Acceptance sampling involves inspecting a sample from a batch or lot of finished products to determine if the batch should be accepted or rejected. Therefore, it occurs after the production process is complete.

Question 9

Descriptive statistics are used to describe quality characteristics and relationships.

Accepted Answer

Descriptive statistics summarize and describe the main features of a dataset, including measures of central tendency, variability, and correlation. They do not involve making inferences or testing hypotheses, but rather provide a way to understand and communicate the characteristics and patterns within the data.

Question 10

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 11

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 =11f004a4_ac54_51de_ae3a_b1d7f49b58bd_TB5472_00 = 32/200 + 3 * $\surd$(32/200) = 1.36)

Question 12

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

Ritz-Carlton employees are empowered to spend up to $2000 on the spot to resolve any customer complaint, ensuring high levels of customer satisfaction and service recovery.

Question 13

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 14

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 =11f004a4_93b0_f25d_ae3a_7bdd22080891_TB5472_00 = 16 + 3 * $\surd$(16) = 4)

Question 15

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

An x-bar chart is used to monitor the average of a process. In this case, we want to monitor the average ounces of the process that fills beer cans, so an x-bar chart is appropriate. The R-chart is used to monitor the range of a process, the p-chart is used for proportion defective data, the c-chart is used for count data, and the OC chart is not a standard control chart.

Question 16

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

A p-chart is appropriate for measuring the proportion of items that fall into a certain category, such as the proportion of candles that are cut longer than 9 inches. The chart tracks the proportion of nonconforming items over time and sets control limits to determine if the process is in control or not. An x-bar chart and R-chart are used for continuous data, while a c-chart is used for counting the number of defects per unit. An OC chart is used to determine the operating characteristic of a sampling plan.

Question 17

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 =11f004a4_60ae_799c_ae3a_131a5dbe4339_TB5472_00= 150/20 + 3 * $\surd$(150/20) = 15.72)

Question 18

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 19

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

Accepted Answer

The range is found by subtracting the smallest value from the largest value in a data set, which will always result in a non-negative value.

Question 20

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

Ritz-Carlton is the only service company to have won the Malcolm Baldrige National Quality Award twice, in 1992 and 1999. The Malcolm Baldrige National Quality Award is a prestigious award given to U.S. businesses for performance excellence and quality achievement.

Quiz 6: Statistical Quality Control

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

Statistical quality control is a subset of statistical process control.

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

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 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?

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

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?

Acceptance sampling occurs after the product has been produced.

Descriptive statistics are used to describe quality characteristics and relationships.

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

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

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

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

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

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

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

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

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?

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

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