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.

delegated (sometimes called enumerated or expressed) powers are specifically granted to the federal government in article i, section 8 of the constitution. this includes the power to coin money, to regulate commerce, to declare war, to raise and maintain armed forces, and to establish a post office.