Charts and stuff

Question 1

Control limits are

Answer 1

limits driven by the natural variability of the process

Question 2

Process Standard Deviation is necessarily equal to the sample standard deviation of the same process. (TF)

Answer 2

False

Question 3

There is no need of revisions of control limits once calculated by the equation of control limits. (TF)

Answer 3

False

Question 4

Never attempt to interpret the X chart when the R chart indicated the out of control condition (TF)

Answer 4

False

Question 5

The 3 sigma limits on Xbar control charts imply that the type I error is

Answer 5

0.0027

Question 6

A variable quality characteristic will have both

Answer 6

Mean and Variability

Question 7

the center line for a x double bar chart denots

Answer 7

mean of means of the sample

Question 8

equation that gives the correct value of A2 used in the equation for control limits of an xbar chart

Answer 8

3 / d2 * SQRT(n)

Question 9

When the upper and lower natural tolerance limits are equal to the upper and lower specification limits, the process capability ratio, cp is ___

Answer 9

1

Question 10

Tolerances are said to be

Answer 10

limits of natural variability

Question 11

A single measurable quality characteristic, such as dimension, weight, or volume, is called

Answer 11

Variable

Question 12

X bar chart is a ___

Answer 12

Variable control chart

Question 13

Stratification is defined as

Answer 13

Tendency for the points to cluster artificially around the center line

Question 14

Process variability can only be described and monitored by the s control chart

Answer 14

False, s control chart and R control chart

Question 15

Shift in the process level can be seen on the control chart when

Answer 15

Introduction of new workers or change in methods

Question 16

In the general equation of UCL of a control chart, for nay xbar chart, which of these is used as the estimator of u(mean)

Answer 16

X double bar

Question 17

Quantitites that can be numerically measured, can be plotted on a ___

Answer 17

x bar chart

Question 18

S chart is used to monitor ____ of a quality characteristic

Answer 18

Variability

Question 19

Once a set of reliable control limits is obtained, we use the control chart for the monitoring future production. This is called

Answer 19

Phase II control chart usage

Question 20

Specifications have the same meaning as ___

Answer 20

tolerances

Question 21

When R chart is out of control

Answer 21

Eliminate the out of control points and recalculate the control limits

Question 22

X bar chart monitors

Answer 22

Between sample variability

Question 23

Which chart should be interpreted first when both x bar chart and R chart are indicating a non random behavior

Answer 23

R chart

Question 24

Unlike X bar chart, which measures between sample variability only, an R chart is used to monitor ___

Answer 24

within sample variability only

Question 25

If the sample size for a P chart is 50, and the value for the center line is 0.2312 what will be the value of the LCL of the chart

Answer 25

0.0524