1. To study process Y, the quality engineer collected 20 subgroups of 6 observations and determined the following control limits for the Xbar-R chart: X bar chart: UCL=17.62; LCL=14.34 R chart: UCL= 7.50; LCL=0 Suppose that a new sample of six observations was collected and had the following values: 15.3, 18.2, 17.8, 19.6, 18.3, 13.1. Based on the above control limits, which of the following statements is most accurate regarding the new sample?

a. Both the mean and the range are in control

b. The mean is in control, but the range is not in control

c. The range is in control, but the mean is not in control

d. Neither the mean nor the range is in control

2.

Which of the following is not true regarding control charts?

	a.	control charts can be used to monitor a process for the existence of special cause variation.
	b.	the major components of a control chart are the lower control limits, and the center line, and the upper control limits.
	c.	control charts alone can determine the source of problems.
	d.	control charts are similar to run charts in that data is plotted versus time