Different types of bias in research and discuss, homework help

This questions focuses on the other aspects of research. Discuss the following questions .Use APA citations and include at least 2 references for each question1. Different types of bias in research and discuss.2. Experimental and Non-Experimental Research3. Distinguishing between a Sample and a Population and then compare at least two sampling methods (e.g. random sampling vs. stratified random sampling or convenience and quota sampling methods?