Statistical Process Control
Activities in Daily Routine
Application of Statistical Process Control and Solving the Problem
(a) Statistical Process Control: X-bar Charts
(b) Weekly Morning Time Utilization Chart
Observations from the chart
Effect of Seasonal Factors
Seasonal Factors
Usefulness of Confidence Intervals
This paper is on process control of activities that happen on daily basis. Statistical Process Control (SPC) involves application of statistical methods and procedures (such as control charts) to analyze the inherent variability of a process or its outputs to achieve and maintain a state of statistical control, and to improve the capability, also called statistical quality control . (Business Dictionary, 2010). The total time taken from waking up till reaching the office after going through various chores is 85 minutes. The person wants to cut it down to 60 minutes. He thinks of foregoing his leisurely sipping of coffee and watching news for 20 minutes and substitute it with taking coffee in the car and listening to radio for news. That is a way a common man looks at the problem.
Sipping coffee in the car and listening to radio form for news is not the same as doing the same in comfort at home. So an alternate solution is to be chalked out. This is exactly where the Process Selection Control and design step in. Let us now see how the concept can be applied to the problem.
2. Application of Statistical Process Control and Solving the Problem
Details of total time spent on taking bath, getting ready, taking coffee and watching news and travel to office for six days in a week are given below.
Day
Time Consumed (in min)
Monday
84
Tuesday
85
Wednesday
83
Thursday
87
Friday
86
Saturday
84
Average
84.83
(a) Statistical Process Control: X-bar Charts
Let us start by calculating the average for the data points.
Where
is the individual result and 'n' is the total number of results.
minutes.
Let us now calculate the upper control limit, UCL and lower control limit LCL.
UCL (calculated) =
LCL (calculated) =
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