Question 1

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

Accepted Answer

The range is the difference between the highest and lowest values in a data set, so it will always be non-negative.

Question 2

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 variation is crucial in determining whether a process is in control or out of control, and can help identify opportunities for improvement.

Question 3

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 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

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 6

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 7

Acceptance sampling occurs after the product has been produced.

Accepted Answer

Acceptance sampling involves inspecting a sample of the already produced products to determine if the entire batch meets the predetermined quality standards.

Question 8

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)

Question 9

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 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

Descriptive statistics are used to describe quality characteristics and relationships.

Accepted Answer

Descriptive statistics are used to summarize and describe important characteristics of a dataset, such as measures of central tendency, measures of variability, and graphical representations. Descriptive statistics are often used to gain insights into the data and identify patterns or trends.

Question 12

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 13

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 14

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.

Question 15

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 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

Since we are measuring the percentage of candles that are cut longer than 9 inches, and the data is binary (either the candle is longer than 9 inches or it is not), the appropriate control chart would be a p-chart. The p-chart is used to monitor the proportion of nonconforming items in a sample. In this case, the nonconforming candles would be those that are cut longer than 9 inches.

Question 17

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 x-bar chart is designed to monitor the average measurement of a process over time, making it the most appropriate choice for monitoring the average ounces of a process that fills beer cans. The chart plots the sample means over time to detect any shifts or changes in the process. The R-chart is used to monitor the variability of the process, and the p-chart and c-chart are used for monitoring proportions and counts, respectively. The OC chart is not a commonly used control chart.

Question 18

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 of data around the mean, not the difference between the largest and smallest observations.

Question 19

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 20

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) would be appropriate for monitoring the variability in ounces of a process that fills beer cans. It is used to monitor the process variation by looking at the range of consecutive subgroup measurements.

Quiz 6: Statistical Quality Control

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

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

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

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?

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.

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?

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

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?

Descriptive statistics are used to describe quality characteristics and relationships.

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

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

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

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

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

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

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?