Refer to Table S6.1 - Factors for Computing Control Chart Limits (3 sigma)

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for this problem.

Twelve samples, each containing five parts, were taken from a process that produces steel rods at Emmanual Kodzi's factory. The length of each rod in the samples was determined. The results were tabulated and sample means and ranges were computed. The results were:

Sample	Sample Mean (in.)	Range (in.)	Sample	Sample Mean (in.)	Range (in.)
1	10.002	0.011	7	10.001	0.008
2	10.002	0.014	8	10.005	0.013
3	9.991	0.007	9	9.995	0.004
4	10.006	0.018	10	10.001	0.011
5	9.997	0.013	11	10.001	0.014
6	9.999	0.012	12	10.006	0.009

Part 2

For the given data, the

x

=

enter your response here

inches (round your response to four decimal places).

Part 3

Based on the sampling done,

the

control limits for 3-sigma

x

chart are:

Upper Control Limit

(UCLx)

=

enter your response here

inches (round your response to four decimal places).

Part 4

Lower Control Limit

(LCLx)

=

enter your response here

inches (round your response to four decimal places).

Part 5

Based on the

x-chart,

is one or more samples beyond the control limits?

Yes

No

.

Part 6

For the given data, the

R

=

enter your response here

inches (round your response to four decimal places).

Part 7

The control limits for the

3-sigma

R-chart are:

Part 8

Upper Control Limit

(UCLR)

=

enter your response here

inches (round your response to four decimal places).

Part 9

Lower Control Limit

(LCLR)

=

enter your response here

inches (round your response to four decimal places).

Part 10

Based on the R-chart, is one or more samples beyond the control limits?

Yes

No

.