Question 1

If Y is a Poisson random variable with parameter $\theta$ then E(Y) = __________, V(Y) = __________, and also has approximately a __________ distribution when $\theta$ is large $\text { ( } \theta \geq 10 \text { will suffice for most purposes) }$

Accepted Answer

The answer of If Y is a Poisson random variable...

Question 2

One important characteristic of a sampling plan with rectifying inspection is the __________, denoted by AOQ.

Accepted Answer

The answer of One important characteristic of a sampling plan...

Question 3

The average outgoing quality equals 0 when the proportion of defective items in the lot, p, is either __________ or __________.

Accepted Answer

The answer of The average outgoing quality equals 0 when...

Question 4

Which of the following are not examples of assignable causes of variation?

Accepted Answer

Environmental factors are not assignable causes of variation because they are not specific to a particular process or product.

Question 5

The __________ is a chart developed by Kenneth Kemp that can be used to determine values of h and n that achieves a specified ARL (average run length).

Accepted Answer

The answer of The __________ is a chart developed by...

Question 6

There are two equivalent versions of a cumulative sum procedure for a process mean, one __________ and the __________.

Accepted Answer

The answer of There are two equivalent versions of a...

Question 7

Let p denote the proportion of defective items in the lot, and P(A) denote the probability that the lot is accepted. Let us designate two different values of p, one for which P(A) is a specified value close to 1 and the other for which P(A) is a specified value near 0. These tow values of $p - \operatorname { say } p _ { 1 } \text { and } p _ { 2 } -$ are often called the __________, denoted AQL, and the __________, denoted by LTPD.

Accepted Answer

The answer of Let p denote the proportion of defective...

Question 8

In a double-sampling plan, it is customary to terminate inspection of the second sample if the number of defectives is sufficient to justify rejection before all items have been examined. This is referred to as __________ in the second sample.

Accepted Answer

The answer of In a double-sampling plan, it is customary...

Question 9

If the size of a shift in a process mean $\mu$ is .40, then the customarily value of the slope of the lower arm of the V-mask is __________.

Accepted Answer

The answer of If the size of a shift in...

Question 10

Which of the following statements are not true?

Accepted Answer

All the statements provided are true. Statement A correctly identifies the benefits of raising quality levels, Statement B accurately describes the use of control charting in industry, and Statement C correctly explains the statistical basis for control charts.

Question 11

Under curtailment in a double-sampling plan, it can be shown that the expected number of items inspected in a __________ is smaller than the number of items examined in a __________ when the operating characteristic (OC) curves of the two plans are close to be identical.

Accepted Answer

The answer of Under curtailment in a double-sampling plan, it...

Question 12

At time r, a process is judged out of control if any of the cumulative sum plotted values $\left( 1 , S _ { 1 } \right) , \left( 2 , S _ { 2 } \right) , \ldots \ldots , \left(y , S _ { \mathrm { r } } \right)$ lies outside the __________; either above the upper arm or below the lower arm.

Accepted Answer

The answer of At time r, a process is judged...

Question 13

The 3-sigma control limits of the p chart for the fraction of defective items in a process believed to be in control are LCL = .0125 and UCL = .1425. If the smallest and largest values of $\hat { p } ,$ the fraction of defective items, are .0062 and .1685 respectively, then the process is __________.

Accepted Answer

The answer of The 3-sigma control limits of the p...

Question 14

Which of the following statements are true?

Accepted Answer

All of the statements (A, B, C, and D) are true.

Question 15

The use of 3-sigma control limits is presumed to result in P(statistic <LCL $\approx$ __________, when the process is in control.

Accepted Answer

The answer of The use of 3-sigma control limits is...

Question 16

The p control chart for the fraction of defective items produced is based on the __________ probability distribution.

Accepted Answer

The answer of The p control chart for the fraction...

Question 17

The behavior of a sampling plan can be nicely summarized by graphing P(A); the probability that the lot is accepted, as a function of p; the proportion of defective items in the lot. Such a graph is called the __________ for the plan.

Accepted Answer

The answer of The behavior of a sampling plan can...

Question 18

Suppose that 25 samples, each of size 100, were selected from what is believed to be an in-control process, and that $\sum \hat { p } _ { i} = 1.8$ where $\hat { p } _ { i }$ is the fraction of defective items in sample i. The p chart for the fraction of defective items has its center line at height equals to __________.

Accepted Answer

The answer of Suppose that 25 samples, each of size...

Question 19

If $Y _ { 1 } , Y _ { 2 } , \ldots Y _ { n }$ are independent Poisson variables with common parameter $\theta$ then $\sum _ { i = 1 } ^ { n } Y _ { i }$ has also a Poisson distribution with parameter $\lambda$ = __________, where $\lambda$ denotes the expected number of defects per unit.

Accepted Answer

The answer of If \(Y _ { 1 } ,...

Question 20

Which of the following statements are not true?

Accepted Answer

Control charts and acceptance sampling plans were actually developed much earlier, in the 1920's and 1930's.

Quiz 16: Quality Control Methods

If Y is a Poisson random variable with parameter $\theta$ then E(Y) = , V(Y) = , and also has approximately a __ distribution when $\theta$ is large $\text { ( } \theta \geq 10 \text { will suffice for most purposes) }$

One important characteristic of a sampling plan with rectifying inspection is the __________, denoted by AOQ.

The average outgoing quality equals 0 when the proportion of defective items in the lot, p, is either or .

Which of the following are not examples of assignable causes of variation?

The __________ is a chart developed by Kenneth Kemp that can be used to determine values of h and n that achieves a specified ARL (average run length).

There are two equivalent versions of a cumulative sum procedure for a process mean, one and the .

In a double-sampling plan, it is customary to terminate inspection of the second sample if the number of defectives is sufficient to justify rejection before all items have been examined. This is referred to as __________ in the second sample.

If the size of a shift in a process mean $\mu$ is .40, then the customarily value of the slope of the lower arm of the V-mask is __________.

Which of the following statements are not true?

Under curtailment in a double-sampling plan, it can be shown that the expected number of items inspected in a is smaller than the number of items examined in a when the operating characteristic (OC) curves of the two plans are close to be identical.

At time r, a process is judged out of control if any of the cumulative sum plotted values $\left( 1 , S _ { 1 } \right) , \left( 2 , S _ { 2 } \right) , \ldots \ldots , \left(y , S _ { \mathrm { r } } \right)$ lies outside the __________; either above the upper arm or below the lower arm.

Which of the following statements are true?

The use of 3-sigma control limits is presumed to result in P(statistic <LCL $\approx$ __________, when the process is in control.

The p control chart for the fraction of defective items produced is based on the __________ probability distribution.

The behavior of a sampling plan can be nicely summarized by graphing P(A); the probability that the lot is accepted, as a function of p; the proportion of defective items in the lot. Such a graph is called the __________ for the plan.

If $Y _ { 1 } , Y _ { 2 } , \ldots Y _ { n }$ are independent Poisson variables with common parameter $\theta$ then $\sum _ { i = 1 } ^ { n } Y _ { i }$ has also a Poisson distribution with parameter $\lambda$ = __________, where $\lambda$ denotes the expected number of defects per unit.

Which of the following statements are not true?

Quiz 16: Quality Control Methods

One important characteristic of a sampling plan with rectifying inspection is the __________, denoted by AOQ.

The average outgoing quality equals 0 when the proportion of defective items in the lot, p, is either __________ or __________.

Which of the following are not examples of assignable causes of variation?

The __________ is a chart developed by Kenneth Kemp that can be used to determine values of h and n that achieves a specified ARL (average run length).

There are two equivalent versions of a cumulative sum procedure for a process mean, one __________ and the __________.

In a double-sampling plan, it is customary to terminate inspection of the second sample if the number of defectives is sufficient to justify rejection before all items have been examined. This is referred to as __________ in the second sample.

If the size of a shift in a process mean μ\muμ is .40, then the customarily value of the slope of the lower arm of the V-mask is __________.

Which of the following statements are not true?

Under curtailment in a double-sampling plan, it can be shown that the expected number of items inspected in a __________ is smaller than the number of items examined in a __________ when the operating characteristic (OC) curves of the two plans are close to be identical.

Which of the following statements are true?

The use of 3-sigma control limits is presumed to result in P(statistic <LCL ≈\approx≈ __________, when the process is in control.

The p control chart for the fraction of defective items produced is based on the __________ probability distribution.

The behavior of a sampling plan can be nicely summarized by graphing P(A); the probability that the lot is accepted, as a function of p; the proportion of defective items in the lot. Such a graph is called the __________ for the plan.

Which of the following statements are not true?

The average outgoing quality equals 0 when the proportion of defective items in the lot, p, is either or .

There are two equivalent versions of a cumulative sum procedure for a process mean, one and the .

If the size of a shift in a process mean $\mu$ is .40, then the customarily value of the slope of the lower arm of the V-mask is __________.

Under curtailment in a double-sampling plan, it can be shown that the expected number of items inspected in a is smaller than the number of items examined in a when the operating characteristic (OC) curves of the two plans are close to be identical.

The use of 3-sigma control limits is presumed to result in P(statistic <LCL $\approx$ __________, when the process is in control.