Quality control engineers fire tiles made with a new materia

Quality control engineers fire tiles made with a new material at three different temperature settings (1500 degree F. 1800 degree F and 2200 degree F) 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.. What is the number of treatments in this experiment?

Solution

number of (possible) treatments are 3*4 = 12