Automobile motor oil is either synthetic or conventional. An experiment is to be conducted to determine whether the mileage before an oil change is needed is the same for both types of oil. In previous studies , it was determined that car age (new, old) is associated with frequency of oil changes , but car size (small, medium , large) is not associated with frequency of oil changes. How would blocking best be used?

A. By blocking on car size
B. By blocking on car age
C. By blocking on mileage
D. By blocking on oil type
E. Blocking is not suggested

B. by blocking on car age

got it right on the quiz :)

the correct answer is a) they believe they have a "just cause."

islamic terrorists justify their violent actions because they believe they have a "just cause."

every act of terrorism of islamic sects is done “in the name of allah”. that justifies their actions. islam people who commit those terrorist attacks are not afraid to die. that is why the attacks have horrible consequences. they know they are going to die and they are proud to do it because it is in the name of allah, so it is justified and is for a “good cause.”

since the very beginning of the conflict with israel, islam is fighting a “sacred war”, respecting the words stated in the qur’an. they fight against the domination of the western countries and to defend their occupied territories.