Things that mess up data

NO PLACEBO FOR CLINICAL TRIAL

MURDERER FOUND INNOCENT

LOW P VALUE=HA IS CORRECT

PREGNANT WOMAN ISN'T PREGNANT

HAND PICKING VOLUNTEERS

CONVENIENCE SAMPLE

INNOCENT MAN FOUND GUILTY

PERSON W/ FLU TESTS HEALTHY

SAMPLE RESULTS=POPULATION

PREGNANT GRANDPA

SMALL SAMPLE

HEALTHY PATIENT DIAGNOSED W/ FLU

SIGNIFICANCE=HO IS REJECTED

REJECT HO

CORRELATION=CAUSATION

DON'T REJECT HO