It is necessary to control the percentage of solids in a product, so samples are taken
Chapter 9, Problem 9.7-2(choose chapter or problem)
It is necessary to control the percentage of solids in a product, so samples are taken randomly throughout the day and the percentage of solids is measured. Use the following 20 sets of 5 observations for this exercise:
(a) Calculate the values of \(\bar {\bar x}\), \(\bar s\), and \(\bar R\).
(b) Use the values of \(A_3\) and \(\bar s\) to construct an \(\bar x\) chart.
(c) Construct an s chart.
(d) Use the values of \(A_2\) and \(\bar R\) to construct an \(\bar x\) chart.
(e) Construct an R chart.
(f) Do the charts indicate that the percentage of solids in this product is in statistical control?
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