The amplitude of sound waves is measured in ____; the frequency of sound waves is measured in ____

Researchers investigating a rare disorder that affects only a few subjects would most likely use a( n ) _____ design.

A)natural experimental B)experimental C)quasi-experimental D)single-subject experimental

What term do epidemiologists use to designate the rate or number of new cases of a disorder reported during a specified period?

a) frequency b) incidence c) occurrence d) prevalence