PROBLEMS
2. Control charts for X and R are to be established on a certain dimension part, measured in millimeters. Data were collected in subgroup sizes of 6 and are given below. Determine the trial central line and control limits. Assume assignable causes and revise the central line and limits.

From Table B in the appendix, the values for the factors for 6 subgroup size (n) of r are A2 = 0.483, D4 = 2.004, D3 = 0. Trial control limits for the X chart are

UCLR = D4R LCL R = D3R
= (2.004) (0.3556) = (0) (0.3556)
= 0.71 mm = 0 mm

Revise the central line and limits:
a) One of point is outside control limit (mean of subgroup number 4 (20.65mm) above UCL x-chart (20.57mm) / range of subgroup number 18 (0.73mm) above UCL R-chart (0.71mm). This is showed that this process is out of control. The special cause variation exists in this x-chart.

Assume assignable causes are machine technical problem or bad material. 3. The following table gives the average and range in kilograms for tensile tests on an improved plastic cord. The subgroup size is 4. Determine the trial central line and control limits. Of any points are out of control, assume assignable causes and calculate revised limits and central line.

...
1: The mean time to clean a motel room is 15.0 min and the standard deviation is 1.6 min and the
data are normally distributed.
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Answer: 0.0301%
Reasoning/Work: from my understanding I subtracted 1.8 from 1.88 which is my answer = .08 then I found the answer on the table
b. What percentage of the rooms will take more than 21.0 min to complete?
Answer: 0 %
Reasoning/Work: the answer is 0.
c. What...

...CONTROL CHARTS FOR VARIABLES
TUTORIAL 4 : CONTROL CHARTS FOR VARIABLES
1. Control charts for X and R are to be established on a certain dimension part, measured in millimeters. Data were collected in subgroup sizes of 6 and are given below. Determine the trial central line and control limits. Assume assignable causes and revise the central line and control limits. SUBGROUP NUMBER 1 2 3 4 5 6 7 8 9 10 11 12 13
X...

...Associate Level Material
Ethical Theory Comparison Chart
Respond to the prompt for each of the five ethical theories listed. One section on each chart has been filled in as an example.
What is good? (1–2 sentences)
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The good for us is defined by our natural objective. It is good to have moral...

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Every organization has both a formal and an informal organizational structure. Examples of organizational structures are:
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Run Charts is a tool for tracking results over a period of time. This can aid in identifying trends or other patterns that may be occurring. Advantages of run charts are ease of construction and interpretation.
For this case study, we came out with seven run charts according to their segments. From this run charts, it is easy for the Tip Top Markets to identify numbers of complaints made by...

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