Saveral ovens in a metal marking shop are used to heat metal specimens. All ovens are supposed to operate at the same temperature. although it is suspected that this may.r not he true. Three ovens are selech at random and their temperatures on successive heats are noted. The data collected are as follows. 491.5 493.3 493.1 494.1 488.4 434.6 4?9.T 4?T.3 483.9 436.9 491. 487.3 l {a} Is there a signicant variation in temperature between ovens in the shop? Use or = 9.05. I {h} Write a statistical model for this experiment and state assumptions associated with the elements in the model. Estimate all parameters in the model. I {c} Find a 95% condence interval for the mean temperature for all ovens in the shop