Observation versus experiment. An LA Times article reported that the artery wall

Question

Observation versus experiment. An LA Times article reported that the artery walls of people living within 100 meters of a highway thicken more than twice as fast as the average person's. Researchers used ultrasound to measure the carotid artery wall thickness of 1483 people living near freeways in the Los Angeles area. The artery wall thickness among those living within 100 meters of a highway increased by 5.5 micrometers (roughly 1/20th the thickness of a human hair) each year during the three-year study, which is more than twice the progression observed in participants who did not live within this distance of a highway.

(a) The study compared artery thickening of subjects in the study who were living within 100 meters of a highway with those who were not.

Without reading any further details of this study, is this an observational study?

(b) Could this study be conducted as a randomized comparative experiment?

(a) The study compared artery thickening of subjects in the study who were living within 100 meters of a highway with those who were not.

Without reading any further details of this study, is this an observational study?

Yes No

(b) Could this study be conducted as a randomized comparative experiment?

Yes No

Explanation / Answer

A) Yes, its observational study

b) No

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