Answer
a. Observational study
b. The researcher cannot conclude that consumption of meat increases cholesterol level. The research may suffer from voluntary response bias, on account of the participants not being selected in a random manner, consequently they will have a very strong opinions or judgment and lead the result to head towards positive conclusion.
Work Step by Step
a. Observational study
b. The researcher cannot conclude that consumption of meat increases cholesterol level. The research may suffer from voluntary response bias, on account of the participants not being selected in a random manner, consequently they will have a very strong opinions or judgment and lead the result to head towards positive conclusion.