I need two titles a books with the same topic 1 non-fiction and 1 historical fiction.

I don't know what topic you want, but a good non-fiction book is The Diary of a Young Girl by Anne Frank and a historical fiction one also about the holocaust is Yellow Star by Jennifer Roy

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.        

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.