For the question that I just uploaded recently and received your answer, I got a different answer than you did. Can you verify that you answer is correct and perhaps say where I am wrong? Here is my answer:

- 20 atewertations wene chtained and the sample means and ranges were computed: u. Using the factors in [ti luble 10.3, determine upper and loape limiss for mean and range charts. Is the process within the eontrol limits? b. 'Lhe time ia minumes nected to assembe security eameras at a prodinetion ficiliry was recorded for cighe sacnples of 15 observations each, and theans and ranges mere comenued, Using fictors from Table 10.3, eonpute eontrol limics for the theans and ratiess to determine if the process is in control