PTE

sample selected using a chance-based selection procedure

invite and enroll suitable people to take part in a study

producing reasonably consistent measurements when repeated under comparable conditions

reflecting relevant characteristics of the target population

person who provides answers to a survey or study questions

proportion of eligible sampled units providing a response under a stated rule

select units or observations from a population for study

process of selecting units or observations for a study

instrument or ordered set of values used to measure a characteristic

a digit retained in a reported number to communicate the meaningful detail of a measurement or calculation

a numerical value calculated from data to describe a sample or pattern

group assigned to receive the study intervention or condition

a characteristic that can have different values across observations in a study

to become suited to environmental conditions through changes in traits or responses

the process of becoming better suited to the conditions of an environment

an inherited feature that improves survival or reproduction in a particular environment

completing its whole life cycle, from seed to death, within one growing season

living or growing in water, or connected with organisms that do so

reproduction involving one parent and no fusion of sex cells, usually producing genetically similar offspring

a single-celled organism belonging to a group whose cells lack a membrane-enclosed nucleus

to reproduce and produce young animals

the part of the year when a particular animal species normally mates and produces young

an organism's coloring, pattern, or shape that helps it avoid being noticed in its surroundings

an animal that feeds mainly on other animals or their flesh

the process in which a cell splits to produce new cells

the thin, flexible boundary that surrounds a cell and regulates movement of substances into and out of it

a grass grown for its edible grain, such as wheat, rice, or corn

to live or remain present together in the same environment at the same time

an ancestral organism from which two or more different organisms or groups descended