An experiment in which the lifestyles of people with lung cancer are compared with the lifestyles of those who do not have lung cancer is an example of 1- a case-control study.

2- the scientific method.

3- an observational study.

4- a human-intervention study.

1- a case-control study

Explanation:

A case–control study is a type of observational study in which two existing groups differing in outcome are identified and compared on the basis of some supposed causal attribute.

the answer is b its not mature

well say a good goal is to do 150 sit ups in a week! or 90 pull ups a day. even 60 push ups in a month these are all fair goals!