In the article “An in vitro comparative study of wettability of four commercially available saliva substitutes and distilled water on heat-polymerized acrylic resin”

published in the Journal of Indian Prosthodontic Society (Sharma and Chitre, 2008), the authors reported a significant F-ratio (F = 62.70, p = 0.000) for testing the equality of the treatment means. Use the information given in Table 12.27 to answer the following questions.

(a) Does it appear reasonable to assume the constant variance assumption of ANOV? Explain.

(b) Separate the treatment means with ???????? = 0.05.