Hearing Loss Is More Common Among Premature Infants Than Among

Multiple Choice

Hearing loss is more common among premature infants than among full-term infants. This was thought to be an effect of premature birth. It has recently been suggested that hearing loss may be caused by the high noise level of the incubators in which the premature infants are placed. This is an example of

A) statistical significance.
B) confounding between two variables.
C) a designed experiment.
D) nonrandom sampling error.
E) matching.