statistics for engineers question please help

I need to write an original question. I will use your answer as a guide to write an original question by myself. I couldn't find a guide or some examples from books or videos. I would reallly appreciate if you know and let me know where I can also find some examples . I dont know where or how to find articles. please let me know . thank you


Active Member
Most real problems are about comparing means, so comparing SD's is quite unusual and you might have a problem finding a journal article about them. One area you might try is industrial control. Often the mean of a process is reasonably easy to change, but the SD is not. Perhaps you want to show that the variance of a new process is less than that of an existing standard process.