Analyze the data shown below obtained at the start of a process. It was known at the time that the process was very unstable. Nevertheless, it was important to compare four variations A, B, C, D of process conditions. The variants A, B, c. D were employed in 32 consecutive iuns with results as follows:
(a) Plot the data. What kind of an experimental design is this?
(b) Make an ANOVA and a graphical ANOVA.
(c) Estimate the mean, with confidence interval, for the four possible process conditions.
(d) Plot the residuals in time order.
(e) Plot the eight averages of the sets of fours runs in time order and comment.