In a normal distribution, how to draw Upper control Limit (UCL) and Lower Control Limit (LCL) using computer?
Which software is useful? Any webpage or article which could explain a step by step procedure would be of great help.
The procedure of interval estimation can be used . The formula is :
Sample Mean (or Proportion) plus/minus (Z-value (based on confidence interval)XStandard error)
Interval estimation, in statistics, the evaluation of a parameter—for example, the mean (average)—of a population by computing an interval, or range of values, within which the parameter is most likely to be located. Intervals are commonly chosen such that the parameter falls within with a 95 or 99 percent probability, called the confidence coefficient. Hence, the intervals are called confidence intervals; the end points of such an interval are called upper and lower confidence limits.
Check out this link
http://www.isixsigma.com/tools-templates/control-charts/a-guide-to-control-charts/
This explains the theory of control charts in a very elegant and simple manner.
The following link tells you how to draw UCL & LCL using Microsoft Excel
https://www.spcforexcel.com/knowledge/control-chart-basics/control-limits
Minitab is a popular tool to do statistical analysis.
You can download a trial version free
http://www.minitab.com/en-us/products/minitab/free-trial/
But after the trial period you will have to pay for it and it may be expensive.
Hope this helps
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