EXPERIMENTAL DESIGNS

Question 1

Types of experimental design

Answer 1

independent group design, repeated measures and matched pair design

Question 2

independent group design

Answer 2

different participants complete in each of the conditions of the experiment.
- participants are randomly allocated to avoid researcher bias.

Question 3

strength of independent group design

Answer 3

• no order effects produced
• participants are less likely to guess the aim of the experiment ( demand characteristics are eliminated)

Question 4

limitation of independent group design

Answer 4

participant variables
- if more participants with a particular characteristics is randomly assigned into the group , it can influence the measurement of depended variable which could be improved by random allocation.

Question 5

repeated measures

Answer 5

the same particpants take part in all of the conditions of the iv.

Question 6

limitations of repeated measures

Answer 6

1. order effects - taking part in the first condition influences the performance in second condition - might worsen due to boredom or fatigue or might imrpove due to practice.
2. participants are more likely to figure out the aim and alter behaviour due to demand characteristics.

however these could be counterbalanced by maybe putting half participants in both condition and asking them to take part in the one that missed in another trial.

Question 7

matched pairs design

Answer 7

• pairs of participants are first matched on some variable thats been found to affect the dependent variable then one member of each pair does one condition and the other does the another.

Question 8

strengths of matched pair design

Answer 8

• no order effects
  -less demand characteristics

Question 9

limitations of a matched pair design

Answer 9

• time consuming
• large pool of potential participants needed which could be hard to get