Word Doc Week 8

Question 1

Single Factor

Answer 1

• One treament/independent variable
• Also know as one-way
  *

Question 2

Between-Subjects

Answer 2

• Independent groups
• subjects in each treatment group are completely independent of each other
• Each subject receives one treatment only
• Each subject is exposed to one level of independent variable

Question 3

F Ratio

Answer 3

• Formed b dividing ldbetween-group variablity by within-group variability

Question 4

Repeated Measures design

Answer 4

• AKA Within subjects design
• When each subject is receives all types of treatments
• Data set up is exaclty the same as for paired-samples t-test
• No separate grouping variable

Question 5

Advantages of within-subjects design

Answer 5

• A source of error is removed
• There can be no idividual differences between groups
• Fewer subjects are required to obtain the same amount of data

Question 6

Problems with within-subjects design

Answer 6

• Drop outs: if you fail to obtain one score from any one subject you have to remove all that subjects data from the analysis
• Practice/order/carry over effects
• Receiving one type of treatment may lead to an improved or varied performance on the other conditions

Question 7

Resolving problems with Within-Subjects designs

Answer 7

• Counterbalance or randomise the testing order
• Ensire different subjects receive treatments in different orders
• Gaurantees that any order effect is at least randomised and not systematic.
• Does not remove the overall problem

Question 8

Order Effect

Answer 8

• When the order that treatments are delivered impact subsequent treatments.
• Not common in cognitive psych, best demostrated in medical or biomedical examples

Question 9

Matched Group Subjects

Answer 9

• Known as a Block
• Matching subjects who are similar and grouping them together
• One way of controlling for individual difference variables between groups

Question 10

Advantages of Block Matching Subjects

Answer 10

• No carry-over, order effects or practice effects
• Can analyse the same as a fully repeated measures design

Question 11

Problems with Block Matching Subjects

Answer 11

• Matching can be difficult
• If you lose one subject in a block you can lose the entire block