Why is research methodology very important?  What are some of the research methods discussed in the video? What are the limitations to using scientific observation/surveys? What does it mean if we say that 2 variables are not correlated (or associated)? If they are positively correlated? If they are negatively correlated? What are the limitations to using correlation? What are the 3 characteristics of experimental research? What is the:Independent variable,Dependent variable What is the difference between experimental groups and control groups?