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Multiple Choice Quiz
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Chapter 13 Quiz - Quality Control and Improvement



1

The chart which involves the number of defects per item, is called the _________ chart.
A)x-bar
B)x
C)R
D)s
E)c
2

The statistician who invented the control chart for use in industrial quality control was:
A)Deming
B)Taguchi
C)Pareto
D)Shewhart
E)none of the above
3

The chart which aggregates poor quality outcomes to show management which are the most important problems is the:
A)s chart
B)Pareto chart
C)R chart
D)x-bar chart
E)Taguchi chart
4

A manufacturer of light bulbs randomly samples 40 bulbs at the end of each shift to test for defective bulbs. The number of defectives in 12 shifts is as follows: 3, 5, 2, 0, 4, 5, 1, 2, 8, 12, 0, and 2.
R-1 Ref 13-2

Compute p-bar for the p chart.

A)44
B)3.75
C)0.0917
D)1.125
E)none of the above
5

A manufacturer of light bulbs randomly samples 40 bulbs at the end of each shift to test for defective bulbs. The number of defectives in 12 shifts is as follows: 3, 5, 2, 0, 4, 5, 1, 2, 8, 12, 0, and 2.
R-1 Ref 13-2

Compute the standard error of p-bar.

A)0.0456
B)0.0841
C)0.09375
D)0.291
E)none of the above
6

A manufacturer of light bulbs randomly samples 40 bulbs at the end of each shift to test for defective bulbs. The number of defectives in 12 shifts is as follows: 3, 5, 2, 0, 4, 5, 1, 2, 8, 12, 0, and 2.
R-1 Ref 13-2

Based on the p chart, is this process in control?

A)no, two sample proportions are outside the limits
B)no, since all but one sample proportion are outside the limits
C)no, exactly one sample proportion is outside the limits
D)yes, it is in control
E)insufficient information to determine
7

Which control chart makes use of the Poisson distribution?
A)x chart
B)x-bar chart
C)s chart
D)R chart
E)c chart
8

The following are the number of flaws in bolts of material for use in industrial upholstering:

4, 6, 7, 8, 7, 5, 10, 15, 7, 6, 8, 5, 6, 8, 10, 4, 8, 5, 4, 6, 4, 6, 7, 5, and 6

R-2 Ref 13-3

Compute the value of c used to estimate the center-line in a c chart for this data.

A)25
B)127
C)5.08
D)6.7
E)none of the above
9

The following are the number of flaws in bolts of material for use in industrial upholstering:

4, 6, 7, 8, 7, 5, 10, 15, 7, 6, 8, 5, 6, 8, 10, 4, 8, 5, 4, 6, 4, 6, 7, 5, and 6

R-2 Ref 13-3

Compute the UCL and LCL respectively.

A)13 and 0
B)20 and 15
C)14 and 0
D)insufficient information to determine
E)none of the above
10

The following are the number of flaws in bolts of material for use in industrial upholstering:

4, 6, 7, 8, 7, 5, 10, 15, 7, 6, 8, 5, 6, 8, 10, 4, 8, 5, 4, 6, 4, 6, 7, 5, and 6

R-2 Ref 13-3

Based on the c chart, is this process in control?

A)it may be out of control, based on one observation outside the limits
B)it appears to be in control
C)several observations are outside the limits
D)insufficient information to determine
E)none of the above
11

The purpose of control charts is to:
A)estimate the proportion of output that is acceptable
B)weed out defective items
C)determine if the output is within tolerances/specifications
D)distinguish between random variation and non-random variation in the process
E)none of these
12

In statistical process control, p-charts are used to signal assignable variation that is affecting the ___________:
A)sample size
B)number of defects in a typical unit of output
C)proportion of defective units being produced
D)useful life period of units produced
E)proportion of variability that can be attributed to random factors





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