If Mindy's doctor has taken a series of images of her brain using X-rays, then she has likely had a(n) ________

An investigator studies the relationship of physical fitness to self esteem in a group of 10 year olds, then measures the relationship in the same children one year and two years later. This is a(n) _____ study

A) cross-sectional B) replicational C) experimental D) longitudinal

An operational definition is a description of some kind of physical event

Indicate whether the statement is true or false