What are the causes for students to drop out of university?​

Reason 1: Expensive tuition fee.

Reason 2: Just not prepared academically.

Reason 3: Unhappy with the college.

Reason 4: Discouraging environment.

Reason 5: Picking the wrong course.

Reason 6: Academic inadequacy.

Explanation:

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

you probably know the answer. stop asking stupid questions and making me waste my time. j.k. ; )   b.t.w. what are three ratios equivalent to 5 : 11? thx