experimental design

Question 1

describe independent groups design

Answer 1

ppts preform in only 1 condition of the IV

Question 2

give strengths of independent groups design

Answer 2

• no order effects
• no demand characteristics

Question 3

give limitations of independent groups design

Answer 3

• no control over ppt variables ( different abilities of ppts in various conditions affect DV)
• need more ppts to gather same amount of data

Question 4

what is a solution to a limitation of independent groups design?

Answer 4

random allocation
- ensures each ppt has the same chance of being in 1 condition of the IV as another

Question 5

describe repeated measures design

Answer 5

same ppts takes part in all conditions of the IV

Question 6

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give strengths of repeated measures design

Answer 6

• eliminates ppt variables
• fewer ppts needed , not as time consuming

Question 7

give a limitation of repeated measures design

Answer 7

-order effects present eg. boredom

Question 8

what is a solution to a limitation of repeated measures design?

Answer 8

counterbalancing
- half the ppts do connditions in 1 order then other half do it in opposite order

Question 9

describe matched pairs design

Answer 9

pairs of ppts first matched on a varibale that affects the DV
then 1 member of each pair does 1 condition and the other does another

Question 10

give strengths of a matched pairs design

Answer 10

• no order effects
• less demand characteristics

Question 11

give limitations of a matched pairs design

Answer 11

• time consuming + expensive to match ppts
• large pool of potential ppts needed
• difficult to know what variables are appropriate for the ppts to be matched