RM- hypothesis + variables

Aim

A general statement that described the purpose of an investigation

Variable

Any ‘thing’ that can vary or change within an investigation

IV

The variable that is manipulated by the researcher

DV

The variable that is measured by the researcher

Control variables

Are kept constant

Operationalisation

Clearly defining variables in terms of how they can be measured

Hypothesis

A clear precise testable statement that predicts what the outcome of an investigation will be

Directional hypothesis

States a direction between two conditions in an investigation

Non directional hypothesis

States a difference between two conditions but not the direction

Null hypothesis

Hypothesis that states NO difference/ relationship between variables

Extraneous variables

A variable other than IV that may affect DV

Situational variables

Aspects of the environment that may affect the performance of the participants

Participant variables

Things about the participants themselves that influence their performance

Investigator effects

Things the researcher does that affect the IV