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5.6. An article in Industrial Quality Control (1956, pp. 5 8) describes an experiment to investigate the effect of the x pe of glass and the type of phosphor on the brightness of a elevision tube. The response variable is the current necessary (in microamps) to obtain a specified brightness level. The data are as follows: Glass Type Phosphor Type 2 3 1 1 280 290 285 230 235 240 300 310 295 260 240 235 290 285 290 220 225 2 230 (a) Is there any indication that either factor influences brightness? Use a = 0.05. (b) the two factors interact? Use a 0.05. (c) Analyze the residuals from this experiment