Fujiyama Electronics Inc. Case Study

Posted by Winnie Melda on January 30th, 2019

• Calculations of X-bar-bar

  From the above table X-bar-bar is 5.10

• Calculations of control limits for x-chart are the same as calculations of average. It follows the following process:

UCL (x-bar-bar +A2)*R-bar where:

X-bar-bar = 5.10

A2 = 0.10

R-bar = 1.10

Therefore: UCL is (5.10+0.10)*1.1

= 5.72

• LCL follows the same formula but with a different sign as follows

 (X-bar-bar +A2)*R-bar

(5.10-0.1)*1.1

= 5.5

Calculation of R chart control limits (Range)

UCL is calculated as D4*R-bar where 1.70*1.10 = 1.87. On the same note UCL is D3*R-bar where 0.5*1.10 = 0.55

The following are the Average and range control 

Average Control Chart

Range Control Chart

Comments

The average is condensed and not sparsely distributed

Fujiyama Second Data Sample

X-bar-bar new data is 5.02 while R-bar is 1.01. Therefore;

Control Limits for X-chart is:

New UCL will be (5.02+0.17)*1.01 = 5.25

New LCL will be (5.02-0.17)*1.01 = 4.90

Chart Control Limits

New UCL is D4*R-bar where 1.57*1.01=1.59

New LCL is D3*R-bar where 0.43*1.01= 0.43

New Average Control Chart

New R-bar Chart

Comments

Both charts are almost similar due to the distribution of range within similar spaces

Sherry Roberts is the author of this paper. A senior editor at MeldaResearch.Com in graduate paper writing service if you need a similar paper you can place your order from custom research paper writing service.