I have randomly assigned 20 observations to treatment and control groups in MINITAB (in c1 and c2)

Now I need to create random disturbances for each observation, but I don't know how. Any suggestions?

Could you explain your purpose? I'm not quite sure what you are trying to accomplish.

Is this a simulation where you are trying to add some "noise" to each result make it more realistic? Or perhaps you want to apply treatments of varying strengths to the items in the treatment group? Something else?

To just add a randomly generated "noise" factor, there is a built-in random number generator that can generate numbers from any distribution you want. You could then use the row calculator to add these random number to the original numbers and store the sum in a new column. You would just have to decide what sort of distribution you would want to use to the random number generator.


Tim F