RESEARCH METHODS (Part2/5) (Aims and hypothesis, variables, sampling)

DPI(1) - AIMS AND HYPOTHESIS 

Aim: General statement about the purpose of the investigation.

Hypothesis: is a statement, a prediction that can be tested.

Null: There is no relationship between variables.

Alternative/Experimental: There is a relationship between variables.

Directional: Predicts a difference between the variables in a particualr direction.

Non-directional: Predicts a general difference between the variables.

DP1(2) - VARIABLES

Variables: Anything that varies, each value of the variable is a level - experimental conditions are levels. 

Experimental variables: IV, DV, EV, CV - When the EV isn't kept constant & changes across conditions.

An experiment aims to control all variables.

Controlling EV: Particpant variables are controlled by the experiment design.

Situational…