Question

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
(b) Use the values of A3 and s to construct an x chart.
(c) Construct an s chart.
(d) Use the values of A2 and R to construct an 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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