Research design, laboratory experiment
Upcoming SlideShare
Loading in...5
×
 

Research design, laboratory experiment

on

  • 2,250 views

 

Statistics

Views

Total Views
2,250
Views on SlideShare
2,212
Embed Views
38

Actions

Likes
0
Downloads
9
Comments
0

2 Embeds 38

http://wellingsocialsciences.blogspot.co.uk 37
http://www.wellingsocialsciences.blogspot.co.uk 1

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

Research design, laboratory experiment Research design, laboratory experiment Presentation Transcript

  • MONDAY 15th October 2012 Research MethodsL/O: to develop our understanding how psychological research is carried out (AO3) The findings can be said toGood research should be: apply to others outside the sample. The experiment can be reliably• Valid repeated.• Generalisable If the experiment was done again, the results would be the• Reliable same or similar.• Replicable The experiment is measuring what it claims to measure.
  • L/O: to develop our understanding how psychological research is carried out (AO3)Good research should be: The experiment is measuring• Valid what it claims to measure. The findings can be said to• Generalisable apply to others outside the sample. If the experiment was done• Reliable again, the results would be the same or similar.• Replicable The experiment can be reliably repeated.
  • L/O: to develop our understanding how psychological research is carried out (AO3)Laboratory experiment:- Deliberately manipulates and controls the variables- Looks for causal relationshipse.g. 2 groups do the same task with one difference any differences between the 2 groups assumed to be due to that one difference.
  • L/O: to develop our understanding how psychological research is carried out (AO3)Laboratory experiment:• It is the IV that varies.• And the DV that changes. Example: both groups drop a tennis ball One group – wet ball (IV) Other group – dry ball (IV) Speed of drop (DV)
  • L/O: to develop our understanding how psychological research is carried out (AO3) REMEMBER:Aim: to investigate the effects of music on memory. Extraneous variablesHypothesis: Music to be controlled affects (non- need (rhythmic noise)directional) memory (recall on a word list test). for! Less control = lessConditions valid.Experimental condition: the IV appears e.g. music(wet ball)Control condition: e.g. silence (dry ball).
  • L/O: to develop our understanding how psychological research is carried out (AO3)Standardised procedures• Instructions: same for all participants.• Why? Reduction of researcher bias.
  • L/O: to develop our understanding how psychological research is carried out (AO3) Experiments Complete the table for Field and Natural Experiments using text book pages 31-32. Laboratory Field NaturalFeatures - Controlled -IV deliberately - No manipulation of - IV deliberately manipulated variables manipulated - In natural - In natural - Looking for causal environment environment relationship - Participants are - Participants are - Standardised unaware of unaware of procedures. experiment (lack of experiment (lack of *Research design informed consent). informed consent). applies to this method only*Strengths - replicable - Ecological validity. - High ecological - Validity (unless real - Little to no validity. life, behavioural) demand - Little to no characteristics. demand
  • L/O: to develop our understanding how psychological research is carried out (AO3) Quasi- experiment - Researcher cannot manipulate the IV - E.g. effects of gender on intelligence. IV: gender CANNOT CHANGE! DV: intelligenceLaboratory?Field?Natural?
  • L/O: to develop our understanding how psychological research is carried out (AO3) Quick test! Total 10 marks in 10 minutes.Explain what is meant by… (1 mark)Explain one strength and one limitation of… (2+2 marks)RIM1) Repeated Measures Design You did this one in2) Independent Groups Design the exam paper3) Matched Pairs Design
  • L/O: to develop our understanding how psychological research is carried out (AO3)Repeated Measures DesignCounterbalancing- A way to overcome order effects.- E.g. half of the participants do no noise followed by noise the next day (control condition followed by experimental condition).- Other half do the reverse (experimental then control).Result: order effects appear in both conditionstherefore balanced.
  • Dave, a middle-aged male researcher, approached an adult in a busy street. He askedthe adult for directions to the train station. He repeated this with 29 other adults.Each of the 30 adults was then approached by a second researcher, called Sam, whoshowed each of them 10 photographs of different middle-aged men, including a photoof Dave. Sam asked the 30 adults to choose the photo of the person who had askedthem for directions to the train station.Sam estimated the age of each of the adults and recorded whether each one hadcorrectly chosen the photo of Dave.Suggest one reason why the researcher decided to use a fieldexperiment rather than a laboratory experiment (2 marks)Identify one possible extraneous variable in this experiment. Explainhow this extraneous variable could have affected the results of thisexperiment.Extraneous variable……………………………………………………………………………….(1 mark)How this could have affected theresults……………………………………………………………………………………………………(3 marks)
  • Suggest one reason why the researcher decided to use a fieldexperiment rather than a laboratory experiment (2 marks)Participants are less likely to show demand characteristicsas in part 1 (Dave asking for directions) they are unawarethat they are taking part in an experiment.OrIn real life situations people tend to respond genuinely sothe research findings are more likely to be generalisablethan if it was a laboratory experiment.*when you have studied EWT you will likely mention thatthis is important in an EWT experiment to be valid*
  • Identify one possible extraneous variable in this experiment.Explain how this extraneous variable could have affected theresults of this experiment.Extraneous variable………………………………………………………………1 mark)How this could have affected theresults………………………………………………………..(3 marks)e.g. how the researcher asked for directions, time of day, gender / eyesight of participants.(Anything other than IV for 1 mark)