An experiment is conducted to study the influence of operating temperature and three types of face-plate glass

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An experiment is conducted to study the influence of operating temperature and three types of face-plate glass in the light output of an oscilloscope tube. The following data are collected: 

 Temperature Glass Type 100 125 150 580 1090 1392 1 568 1087 1380 570 1085 1386 550 1070 1328 2 530 1035 1312 579 1000 1299 546 1045 867 575 1053 904 599 1066 889 3.


(a) Use α = 0.05 in the analysis. Is there a significant interaction effect? Does glass type or temperature affect the response? What conclusions can you draw?

(b) Fit an appropriate model relating light output to glass type and temperature.

(c) Analyze the residuals from this experiment. Comment on the adequacy of the models you have considered.

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