Question 1

A graph showing the probability of accepting the lot as a function of the percent defective in the lot is

Accepted Answer

A)  a power curve. 
B)  a control chart. 
C)  an operating characteristic curve. 
D)  np ​curve. 
A)  a power curve. 
B)  a control chart. 
C)  an operating characteristic curve. 
D)  np ​curve.

Question 2

An operating characteristic curve is based on a ________ probability distribution.​

Accepted Answer

A)  ​normal 
B)  ​exponential 
C)  ​binomial 
D)  ​uniform 
A)  ​normal 
B)  ​exponential 
C)  ​binomial 
D)  ​uniform

Question 3

An   chart could be used if the quality of the output of the process is measuring a process using sample

Accepted Answer

A)  means. 
B)  variances. 
C)  ranges. 
D)  proportions. 
A)  means. 
B)  variances. 
C)  ranges. 
D)  proportions.

Question 4

The sample result plotted on an np control chart is​

Accepted Answer

A)  ​the number of defects per part in the sample.​ 
B)  ​the nominal percentage of correctable defects. 
C)  ​the number of perfect units in the sample. 
D)  ​the number of defective units in the sample. 
A)  ​the number of defects per part in the sample.​ 
B)  ​the nominal percentage of correctable defects. 
C)  ​the number of perfect units in the sample. 
D)  ​the number of defective units in the sample.

Question 5

A(n) _____ chart is used to monitor the number of defectives in the sample.

Accepted Answer

A)    
B)  R. 
C)  p. 
D)  np. 
A)    
B)  R. 
C)  p. 
D)  np.

Question 6

A type II error would occur if we continued to allow the production process to be

Accepted Answer

A)  out of control. 
B)  in statistical control. 
C)  adjusted when in control. 
D)  random. 
A)  out of control. 
B)  in statistical control. 
C)  adjusted when in control. 
D)  random.

Question 7

Process control and acceptance sampling procedures are most closely related to _____ procedures.

Accepted Answer

A)  linear regression 
B)  interval estimation 
C)  hypothesis testing 
D)  analysis of variance 
A)  linear regression 
B)  interval estimation 
C)  hypothesis testing 
D)  analysis of variance

Question 8

If the lower control limit of a P chart is negative,

Accepted Answer

A)  a mistake has been made in the computations. 
B)  use the absolute value of the lower limit. 
C)  it is set to zero. 
D)  it is an indication that the process is out of control. 
A)  a mistake has been made in the computations. 
B)  use the absolute value of the lower limit. 
C)  it is set to zero. 
D)  it is an indication that the process is out of control.

Question 9

The results of inspection of samples of a product taken over the past 10 days are given below. Sample size for each day has been 140.
​   ​
Determine the 97% upper and lower control limits for the p-chart.

Accepted Answer

UCL = 0.07

Question 10

A(n) _____ chart is used to monitor the proportion of defective in the sample.

Accepted Answer

A)    
B)  R. 
C)  p. 
D)  np. 
A)    
B)  R. 
C)  p. 
D)  np.

Question 11

Consumer's risk is

Accepted Answer

A)  the same concept as the Producer's risk. 
B)  the probability of Type II error. 
C)  the probability of Type I error. 
D)  the probability of rejecting a good-quality lot. 
A)  the same concept as the Producer's risk. 
B)  the probability of Type II error. 
C)  the probability of Type I error. 
D)  the probability of rejecting a good-quality lot.

Question 12

In quality control terminology, the statistical procedure of acceptance sampling's alternative hypothesis is that

Accepted Answer

A)  the lots are not equal. 
B)  lot 1 is greater than lot 2. 
C)  it is a good-quality lot. 
D)  it is a poor-quality lot. 
A)  the lots are not equal. 
B)  lot 1 is greater than lot 2. 
C)  it is a good-quality lot. 
D)  it is a poor-quality lot.

Question 13

Control charts based on data that can be measured on a continuous scale are called _____ control charts.

Accepted Answer

A)  normal 
B)  variables 
C)  attributes 
D)  precision 
A)  normal 
B)  variables 
C)  attributes 
D)  precision

Question 14

The results of inspection of samples of a product taken over the past 8 days are given below. Sample size for each day has been 120.   Determine the 97% upper and lower control limits for the p-chart.

Accepted Answer

LCL = 0.00

Question 15

In acceptance sampling, the risk of accepting a poor-quality lot is known as

Accepted Answer

A)  Consumer's risk. 
B)  Producer's risk. 
C)  a Type I error. 
D)  None of these alternatives is correct. 
A)  Consumer's risk. 
B)  Producer's risk. 
C)  a Type I error. 
D)  None of these alternatives is correct.

Question 16

A control chart that is used when the output of a production process is measured in terms of the percent defective is a(n) _____ chart.

Accepted Answer

A)  P 
B)  X bar 
C)  process 
D)  np 
A)  P 
B)  X bar 
C)  process 
D)  np

Question 17

Control charts are classified by the

Accepted Answer

A)  shape of the distribution. 
B)  type of data they contain. 
C)  null hypothesis. 
D)  sample size. 
A)  shape of the distribution. 
B)  type of data they contain. 
C)  null hypothesis. 
D)  sample size.

Question 18

The maximum number of defective items that can be found in the sample and still lead to acceptance of the lot is

Accepted Answer

A)  the upper-control limit. 
B)  the lower-control limit. 
C)  the acceptance criterion. 
D)  rejection criterion. 
A)  the upper-control limit. 
B)  the lower-control limit. 
C)  the acceptance criterion. 
D)  rejection criterion.

Question 19

The upper and lower control limits of the mean of a process are 672 and 654. Samples of size 225 are used for the inspection process. Determine the mean and the standard deviation for this process.

Accepted Answer

Mean = 663

Question 20

Normal or natural randomly occurring variations in the quality of the production outputs that are due purely to chance are _____ causes.

Accepted Answer

A)  assignable 
B)  common 
C)  controllable 
D)  random 
A)  assignable 
B)  common 
C)  controllable 
D)  random

Exam 21: Statistical Methods for Quality Control

A graph showing the probability of accepting the lot as a function of the percent defective in the lot is

An operating characteristic curve is based on a ________ probability distribution.​

An chart could be used if the quality of the output of the process is measuring a process using sample

The sample result plotted on an np control chart is​

A(n) _____ chart is used to monitor the number of defectives in the sample.

A type II error would occur if we continued to allow the production process to be

Process control and acceptance sampling procedures are most closely related to _____ procedures.

If the lower control limit of a P chart is negative,

The results of inspection of samples of a product taken over the past 10 days are given below. Sample size for each day has been 140. ​ ​ Determine the 97% upper and lower control limits for the p-chart.

A(n) _____ chart is used to monitor the proportion of defective in the sample.

Consumer's risk is

In quality control terminology, the statistical procedure of acceptance sampling's alternative hypothesis is that

Control charts based on data that can be measured on a continuous scale are called _____ control charts.

The results of inspection of samples of a product taken over the past 8 days are given below. Sample size for each day has been 120. Determine the 97% upper and lower control limits for the p-chart.

In acceptance sampling, the risk of accepting a poor-quality lot is known as

A control chart that is used when the output of a production process is measured in terms of the percent defective is a(n) _____ chart.

Control charts are classified by the

The maximum number of defective items that can be found in the sample and still lead to acceptance of the lot is

The upper and lower control limits of the mean of a process are 672 and 654. Samples of size 225 are used for the inspection process. Determine the mean and the standard deviation for this process.

Normal or natural randomly occurring variations in the quality of the production outputs that are due purely to chance are _____ causes.

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Comparing Multiple Proportions, Tests of Independence and Goodness of Fit

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Decision Analysis

Index Numbers

Sample Survey

Filters

An operating characteristic curve is based on a ________ probability distribution.

The sample result plotted on an np control chart is

The results of inspection of samples of a product taken over the past 10 days are given below. Sample size for each day has been 140. Determine the 97% upper and lower control limits for the p-chart.