Manuello did an experiment on workers in an insurance company to examine the effect of a new computer system on workers' attitudes and productivity. He had no control group. He noticed that as he simplified the computer system, worker productivity and positive attitude went up. He then complicated the computer system and monitored the workers closely, only to discover that their productivity and positive attitude again increased. What was probably at work?

It depends on the subject for me. some exams are easier than others so i usually go through it and answer questions i know based on my general knowledge, then double check after. going through the lesson can a lot  because the exams can be  very lesson-specific, but sometimes they are ridiculously long so a lot of people don't take the time. i did find that, when i went through the lessons, i was making 100's on my exams vs strictly using + the internet and  i make 90's. 

Number 3 is the logical, go-to answer for the classical school of thought as they strongly believe that an individual commits a crime of their own free will and fully understands the  consequences, making them liable to whatever punishment is dealt to them. 

C. precise