Chapter Two

A group of individuals or events selected to represent the population

The group that receives the experimental treatment

The group that does not receive the experimental treatment

One or more equations that represent the way a system or process works

A testable idea or explanation that leads to a scientific investigation

A logical statement about what will happen if the hypothesis is correct

A piece of information we gather using our senses

The information that a scientist gathers during an experiment

Collection and classification of data that are in the form of numbers

The probability of an unwanted outcome

Associations between two or more events

The factor of interest

The chance that something will happen

Principles or standards we consider important

Conceptual model that provides a systematic process for making decisions

Representations of objects or systems

obtained by adding data for a characteristic and dividing this sum by the number of individuals

Relative arrangement of the members of a statistical population

A procedure designed to test a hypothesis under controlled conditions

A verbal or graphical explanation of how a system works or is organized