6.4 4. A sailboat manufacturer wishes to identify a single epoxy that has high strength at all temperatures. He designs a factorial experiment to evaluate the strength of epoxies from three different manufacturers at low, intermediate, and high temperatures. He performs the experiment in a completely randomized manner by randomly selecting an epoxy and temperature for each run until all experimental runs are completed. The strength data are shown below. Analyze the data by two-way ANOVA and construct an interaction plot. Which manufacturer should he use and what considerations should be made? 20 A 216, 239, 234 Temperature 25 30 344, 335, 348 372, 366, 385 Manufacturer B 278, 299, 271 311, 319, 327 360, 366, 361 с 309, 295, 315 321, 312, 325 371, 361, 349

Fig: 1