Experimental design

Question 1

EXPERIMENTAL CONDITIONS

Answer 1

one or more situations in an experiment which represent different levels of the IV (these are compared to control condition)

Question 2

CONTROL CONDITION

Answer 2

a level of IV where the IV is absent
e.g comparing the effect of decorative lighting on customer satisfaction using neon lights and chandeliers (control condition - no decorative lighting)

Question 3

ORDER EFFECTS

Answer 3

when Ps performance improves/worsens from repeating experiment

Question 4

FATIGUE EFFECTS

Answer 4

Ps who repeat experiment may get bored/tired and worsen performance

Question 5

PRACTICE EFFECTS

Answer 5

Ps who repeat experiment may improve

Question 6

RANDOM ALLOCATION

Answer 6

• reduces effects of participant variable
• they’re placed in levels of IV in a way that they have equal chance of being in any condition

Question 7

COUNTERBALANCING

Answer 7

used to overcome order effect in repeated measure design

Question 8

INDEPENDENT MEASURES DESIGN

Answer 8

each Ps/different group of Ps is used for each level of IV
+ when IV levels reflect different characteristics
+ no order effect - only see experimental conditions once
- participant variables can effect DV
- need twice as many Ps for the same amount of data

Question 9

REPEATED MEASURES DESIGN

Answer 9

each Ps/group of Ps in every level of IV - use the same Ps - act as their own control group
+ less Ps needed
+ remove effects of participant variables
- increase order effects
- increase practice effects
- increase boredom effects
- increase demand characteristics

Question 10

MACHED PAIRS DESIGN

Answer 10

Ps put into pairs - each person in pair are similar - one member of each pair do different levels of IV than the other
+ decrease order effect
+ decrease effect of participant variable
+ no need for counterbalancing
+ decrease demand characteristics - only see IV once
- matching criteria for pairs must be chosen in advance
- impossible to match pairs exactly - time consuming