# Question

Consider the p = 9 process variables in Table 11.5

(a) Perform a PCA on the first 30 observations. Be sure to work with the standardized variables.

(b) How much variability is explained if only the first r = 3 principal components are retained?

(c) Construct an appropriate set of pairwise plots of the first r = 3 principal component scores.

(d) Now consider the last 10 observations. Obtain the principal component scores and plot them on the chart in part (c). Does the process seem to be in control?

(a) Perform a PCA on the first 30 observations. Be sure to work with the standardized variables.

(b) How much variability is explained if only the first r = 3 principal components are retained?

(c) Construct an appropriate set of pairwise plots of the first r = 3 principal component scores.

(d) Now consider the last 10 observations. Obtain the principal component scores and plot them on the chart in part (c). Does the process seem to be in control?

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