This is in Statistics. Explain comprehensively. Avoid plagiarism. thank you and Godbless. Just type only the answers.

3. Consider a medical study that is being performed to test the effect of smoking on lung cancer. Two groups of subjects are identified; one group has lung cancer and the one doesn't have. Both are asked to fill out a questionnaire containing questions about their age, sex, occupation, and number of cigarettes smoked per day. What is the response variable? Which are the factors? What type of study is this (experimental or observational)? Explain