3.

The sample size for an IMR chart

a. can vary according to the defect rate.

b. is larger for variables data than for attributes data.

c. is equal to one.

d. depends on the number of measurements taken.

4.

Which of the following statements is NOT True about Statistical Process Control?

a. It guarantees that all defective products are thrown out before the customer receives them

b. It includes examination of samples, rather than a whole batch

c. It helps discover special cause of variation

d. When a controlled critical to quality (CTQ) characteristic goes above or under the control limits, workers can take action as needed to resolve the issue (e.g. calibrate the equipment).

5.

Which of the following constitutes an approach to reducing sampling error?

Providing statistical training to workers at all organizational levels

Using user-friendly software for data analysis and visualization

Taking a larger sample from the population

Planning the sampling study carefully so that items that are selected are not defectives

6. A precision parts manufacturer produces bolts for use in military aircraft. The specifications for bolt length are 37.50 0.25 cm. The company has established an mc031-1.jpg-chart and an R-chart using samples of size five. The center lines for the mc031-2.jpg-chart and R-chart are set at 37.35 cm and 1.05 cm, respectively. What is the value of Cpk for this process?

a. 0.07

b. 0.28

c. 0.75

d. 0.03

7.

In analyzing an X bar chart, which of the following conditions indicates that a process step is out of control?

a. Any point that falls either below the lower control limit or above the upper control limit

b. Ten consecutive points that are either all above, or all below, the mean line

c. Ten consecutive points that trend either upward or downward

d. All of the above

e. None of the above

8.

One third of the units produced by a particular process step do not meet customer specifications. Which of the following statements is true (in the language of SPC)?

a. the process is in control

b. the process is out of control

c. the process is capable

d. the process is not capable

e. the process is out of control and not capable