Question

The following are quality control data for a manufacturing process at Kensport Chemical Company. The data show the temperature in degrees centigrade at five points in time during a manufacturing cycle.

Sample	x	R
1	95.72	1.0
2	95.24	0.9
3	95.18	0.7
4	95.42	0.4
5	95.46	0.5
6	95.32	1.1
7	95.40	0.9
8	95.44	0.3
9	95.08	0.2
10	95.50	0.6
11	95.80	0.6
12	95.22	0.2
13	95.58	1.3
14	95.22	0.6
15	95.04	0.8
16	95.72	1.1
17	94.82	0.6
18	95.46	0.5
19	95.60	0.4
20	95.74	0.6

A)The company is interested in using control charts to monitor the temperature of its manufacturing process. Compute the upper and lower control limits for the R chart. (Round your answers to three decimal places.)

UCL = ____

LCL = ____

B)Construct the R chart.

C) Compute the upper and lower control limits for the x chart. (Round your answers to three decimal places.)

UCL = ____

LCL = ____

D) Construct the x chart.

E)

What conclusions can be made about the quality of the process?

The R chart indicates that the process variability is (in control/out of control). (no/one/two/more then two) samples fall outside the R chart control limits. The x chart indicates that the process mean is (in control/out of control). (no/one/two/more then two) samples fall outside the x chart control limits.

Answer 1