EXPERIMENTAL DESIGNS

2 GROUPS PARTICIPANTS 2TYPES CONDITIONS 

EG ENERGY DRINK:

GROUP A - EXPERIMENTAL CONDITION

GROUP B - CONTROL CONDITION (WATER)

RECORD MEAN NUMBER WORDS SPOKEN

ISSUE PARTICIPANTS NOT SAME DV RESULT PERSONALITY - RANDOMISATION 

NOT LIKELY GUESS AIMS

ALL CANDITATE DRINK ENERGY & WATER 

EVERYONE DO A THEN B

GUARTNEES COMPARING LIKE WITH LIKE

ISSUES TWO THINGS - FIRST DRINK CONTINUING EFFECT WATER - COUNTERBALANCING

CANDITATES WORK OUT AIM STUDY

PARTICPANTS CONTROLLED & LESS NEEDED

PARTICIPANTS PARIED EG MEMORY TEST BASED IQ

ALLOCATED DIFFERENT VARIABLES 

SINGLE CONDITION DEMAND CHARACTERISTICS NOT PROBLEM

PARTIPACANTS NEVER MATCHED EXACTLY - IMPORTANT DIFFERENCES

TIME CONSUMING COSTS MORE MONEY