An article in Industrial Quality Control (1956, pp. 5-8) describes an experiment to investigate the effect of

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An article in Industrial Quality Control (1956, pp. 5-8) describes an experiment to investigate the effect of the type of glass and the type of phosphor on the brightness of a television tube. The response variable is the current necessary (in microamps) to obtain a specified brightness level. The data are as follows:

Phosphor Type Glass Туре 1 2 280 300 290 1 290 310 285 285 295 290 230 260 220 235 240 225 240 235 230 3. 2.


(a) Is there any indication that either factor influences brightness? Use α = 0.05.

(b) Do the two factors interact? Use α = 0.05.

(c) Analyze the residuals from this experiment.

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