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Question
Submitted by grifin on Mon, 2012-06-11 23:36
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Thermostats are subjected to rigorous testing before they are shipped to air conditioning technicians around the world. Results from the...

Thermostats are subjected to rigorous testing before they are shipped to air conditioning technicians around the world. Results from the last five samples are shown in the table. Is the process under control

Answer
Submitted by shahimermaid on Tue, 2012-06-12 00:44
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the answer is solved in detail

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except xxx 2 observations xx xxx xxxxxxx xx under control

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1. Thermostats are xxxxxxxxx to rigorous testing before xxxx xxx xxxxxxx xx xxx xxxxxxxxxxxx technicians around the xxxxxx xxxxxxx from the last xxxx samples xxx shown in the table. xxxx and x xxxxx xxx an x-bar xxxxxx xxxxx on xxx xxxxxxx is the xxxxxxx under xxxxxxxx xxx Points)

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

 

xxxxxxxxxxxx

xxxxxx

1

x

3

4

x

xxxxx

X xxx

x

1

xxxx

70.8

72.2

xxxx

71

xxxxx

72.22

2.7

x

71.3

xx

xxxx

xxxx

72.2

360.3

72.06

xxx

3

xx

72.6

71.9

xxxx

xxxx

xxxxx

xxxxx

3.3

x

71.1

70.6

xxxx

xxxx

73.6

xxxxx

xxxxx

3.9

x

xxxx

xxxx

70.7

73.5

71.1

xxxxx

71.36

2.8

xxxxx

xxxxxx

14.8

71.93

2.96

xxxx Control xxxxxx

xxxxxxx xxxx (CL) = X xxxxxx bar xxxxxx xxx xxxxxxxxxxx

xxxxx Control Limit (UCL) = x xxxxxx bar x xx x R xxxx

Lower Control Limit (LCL) = x xxxxxx bar x xx * x xxxx

R xxxxxxx xxxxxx

xxxxxxx xxxx (CL) = x bar xxxxxx xxx calculated.

Upper xxxxxxx Limit (UCL) x D4 * R bar.

xxxxx Control Limit (LCL) x xx * x bar.

xx xxx n= 5 xxxxxx

xxxx

D4 = xxxxx

xxxxxxx line= 71.93

xxxxxxxxx + xxxxx x 2.96=73.64

LCL xxxxxxxxxxxx x 2.96=70.22

R control xxxxxx

CL=2.96

xxxx 2.114 x xxxxxxxxx

LCL = xxxxx xxx subgroups xxxxx xx xx you xxxx under the xx xxxxxxx xxxxx is no xxxxxxxxxxx coefficient xx xxxxxx xxxx there xx no LCL.


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