Tablet hardness. Exercise 27.10 concerns process control data on the hardnessof tablets
Chapter 0, Problem 27.12(choose chapter or problem)
Tablet hardness. Exercise 27.10 concerns process control data on the hardnessof tablets (measured in kilograms) for a pharmaceutical product. Table 27.4 givesdata for 20 new samples of size 4, with the x and s for each sample. The processhas been in control with mean at the target value = 11.5 kg and standarddeviation = 0.2 kg.(a) Make both x and s charts for these data based on the information given aboutthe process.(b) At some point, the within-sample process variation increased from =0.2 kg to = 0.4 kg. About where in the 20 samples did this happen? What isthe effect on the s chart? On the x chart?(c) At that same point, the process mean changed from = 11.5 kg to =11.7 kg. What is the effect of this change on the s chart? On the x chart?
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