An article in Industrial Quality Control (1956, pp. 5€“8) describes an experiment to investigate the effect of glass type and phosphor type on the brightness of a television tube. The response measured is the current necessary (in microamps) to obtain a specified brightness level. The data are shown in Table 8E.1. Analyze the data and draw conclusions.

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Glass Phosphor Type Type 1 23 280 300 290 1 290 310 285 285 295 290 230 260 220 2 235 240 225 240 235 230