Question 1

Which of the following is the name of an out-of- control pattern?

Accepted Answer

A)   assignable
B)   causal
C)   shift or jump
D)   a and b C

Question 2

Which of the following subgroup sizes for an X and R chart would not be used?

Accepted Answer

A)   1
B)   4
C)   5
D)   2 A

Question 3

An s chart might be used as a measure of dispersion rather than an R chart because it is:

Accepted Answer

A)   easier to understand
B)   more sensitive to variations
C)   more accurate
D)   b and c B

Question 4

Using the data below, determine the trial central line and trial control limits for the X-bar chart. Subgroup size is 5. For the R chart, the trial central line is 0.11, the UCL is 0.23, and LCL is 0. Note not all of the subgroups are included in the data;however, the sums are correct. $$\begin{array} { | c | c | c | } 
\hline \text { Subgroup } & \text { X-bar } & \text { R } \
\hline 1 & 2.08 & .05 \
\hline 2 & 2.09 & .24 \
\hline 3 & 2.08 & .10 \
\hline \bullet & \bullet & \bullet \
\hline \bullet & \bullet & \bullet \
\hline \bullet & \bullet & \bullet \
\hline 25 & 2.09 & .11 \
\hline & ^{\mathrm { TM } }= 52.00 & ^{\mathrm { TM } }= 2.75 \
\hline
\end{array}$$

Accepted Answer

The answer of Using the data below, determine the trial...

Question 5

The numerator of the capability index equation is the:

Accepted Answer

A)   tolerance
B)   capability ratio
C)   process spread
D)   none of the above

Question 6

Given the following range readings for 25 subgroups of size four, determine the process capability. $\begin{array}{cc}
\text { Subgroup } & \text { R } \
1 & 3.2 \
2 & 3.8 \
3 & 3.6\
⋅&⋅\square\
⋅&⋅\square\
⋅&⋅\
24 & 3.6 \
25 & 3.4\&\square=90.0
\end{array}$

Accepted Answer

The answer of Given the following range readings for 25...

Question 7

The process spread is the same as the:

Accepted Answer

A)   tolerance
B)   quality spread
C)   index
D)   process capability

Question 8

Which of the following subgroup sizes of an X and R chart would most likely be used for costly testing?

Accepted Answer

A)   6
B)   4
C)   5
D)   2

Question 9

When using the X chart the central limit theorem is the basis for a sample size of:

Accepted Answer

A)   2
B)   3
C)   4
D)   5

Question 10

Those causes of variation which are large in magnitude and are not part of the normal variation are:

Accepted Answer

A)   stable causes
B)   chance causes
C)   assignable causes
D)   fluctuating causes

Question 11

A user friendly chart for the operator to use is called:

Accepted Answer

A)   moving average
B)   median
C)   trend
D)   all of the above

Question 12

If only one measurement can be taken at a time, the chart to use is called:

Accepted Answer

A)   moving average
B)   trend
C)   median
D)   sun

Question 13

Those causes of variation which are small in magnitude are:

Accepted Answer

A)   special causes
B)   assignable causes
C)   chance causes
D)   fluctuating causes

Question 14

Which of the following is a source of variation:

Accepted Answer

A)   materials
B)   piece-to-piece
C)   chance
D)   none of these

Question 15

An R chart is not accurate above a sample size of:

Accepted Answer

A)   5
B)   7
C)   10
D)   15

Question 16

The specifications for an electronic device are 3.00 ± 0.10 amps. If the standard deviation is 0.02, what is the capability index?

Accepted Answer

The answer of The specifications for an electronic device are...

Question 17

Of the following, the capability index that is most desirable is:

Accepted Answer

A)   1.00
B)   1.50
C)   0.75
D)   0.30

Exam 6: Control Charts for Variables