Evaluation of flexography printing plates. Refer to the Journal of Graphic Engineering and Design (Vol. 3, 2012)

study of the quality of flexography printing, Exercise 10.34

(p. 552). Recall that four different exposure times were studied—8, 10, 12, and 14 minutes—and that the measure of print quality used was dot area (hundreds of dots per square millimeter). Tukey’s multiple comparisons procedure

(at an experimentwise error rate of .05) was used to LO4 rank the mean dot areas of the four exposure times. The results are summarized below. Which exposure time yields the highest mean dot area? Lowest?

Mean Dot Area: .571 .582 .588 .594 Exposure Time: (minutes) 12 10 14 8