Experimental Designs

define independent design

one group of participants do condition A and a second do condition B (so diferent independet variables) then the DV of each group is compared

define repeated measues

the same participants take part in all conditions of the experiment

define matched pairs

participants are paired together based on a shared variable or a factor which allows the researcher to place them in coordination to their study

write the strengths for a repeated measures design

→fewer participants are needed, so time is saved and money

→participant variables are controlled

write the strengths for a matched pairs design

→helps control participant variables

write the strengths for an independent measures design

→order effects aren’t a problem

→demand characteristics are reduced

write the limitations for a matched pairs design

→time consuming

→difficult to match accurately

→only matches on the known variables

write the limitations for an independent design

→participant variables may cause a confounding variable

→requires a greater amount of participants

write the limitations for a repeated measures design

→order effects: the order in which participants complete their tasks may affect their performance

→demand characteristics

write how we can deal with issues in an independent design

→randomly allocate participants by drawing names from a hat

write how we can deal with issues in a repeated measures design

→counterbalancing the tasks (half of participants do AB, and half do BA)

write how we can deal with issues in a matched pairs design

→pilot study for the key variable to match on (basically evaluating the matched pair variable before going forward with it)