Quality Control Engineers Fire Tiles Made with This New Material

Multiple Choice

Quality control engineers fire tiles made with this new material at three different temperature settings (1500ºF, 1800ºF and 2200ºF) and for four different times (2 hours, 6 hours, 10 hours and 12 hours) to determine the optimal parameter settings for firing that will result in tiles with high flexural strength.The response variable in this experiment is ________________________ .

A) flexural strength
B) firing time
C) firing temperature
D) the new material
E) tiles