Key term:

• Primary source: origin source of the information

Anecdotal evidence ≠ systematic scientific evidence

No scientific theories can be proved (collect infinitive data) → Science can not prove things ≠ Philosophy can prove things.

Không được dùng từ Prove

• Sampling
• Variable

Experimenter bias

Double-blind procedures: cả subjects cả experimenter ko biết để tránh Experimenter bias

• Experiment design :

Random assignment [come later]: make sure two groups same

Radom selection (sampling) [come first]: make sure the sample representative

⇒ Both solves confound

• Research approaches:
• Reliability
• Validity: truthfulness - causality