Deaths from Highway Accidents Went Down After the Adoption of a National

question 32

Multiple Choice

Deaths from highway accidents went down after the adoption of a national 55 mile-per-hour speed limit. Can we be confident that the lower speed limit caused the drop in deaths?

• A) Yes, because the study was a randomized, comparative experiment.
• B) No, because the effect of lower speed limits is confounded with the effect of better highways and safer cars.
• C) Yes, because a drop in deaths over several years can't happen just by chance.
• D) No, because of the placebo effect.
• E) Yes, because correlation implies causation.

---

Definitions:

Endomysium

A connective tissue covering that surrounds individual muscle cells.

Perimysium

A layer of connective tissue that surrounds muscle fibers, grouping them into fascicles.

Fascia

A band or sheet of connective tissue, primarily collagen, beneath the skin that attaches, stabilizes, encloses, and separates muscles and other internal organs.

Fibromyalgia

A condition that exhibits chronic pain primarily in joints, muscles, and tendons.