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Hypothesis and IV and DV

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Hypothesis and IV and DV

  1. 1. How Science Works Experimental method
  2. 2. Experimental Process1. Ask questions and develop theories about how, why and where things happen2. Develop these into a specific hypothesis (predictions)3. Design & Carry out research to test these theories – what happens when we try it out?
  3. 3. Experimental ProcessFindings supportor refute theory =refine theory
  4. 4. Hypotheses• 2 types:Experimental Hypothesis Null Hypothesis(Alternative Hypothesis)- A prediction of the outcome -Findings are due to chance -There is no relationship or difference as predicted
  5. 5. Try writing an Experimental & Null hypothesis for these possible studies1. A study that aims to look at the effect of music on concentration2. A study that aims to look at the amount of TV a child watches and their behaviour at school3. A study that aims to see whether a task, such as counting backwards from the number 15 after seeing a list of letters, will affect the ability to recall of those letters
  6. 6. Experimental HypothesesYou may wish to predict the direction of the effect = Directional / One-tailede.g. – Students’ performance will improve with practice – Eating chocolate will increase happiness – Taking regular exercise will decrease risk of heart disease• Alternatively, you can just say that there will be an effect = Non-directional / Two-tailed
  7. 7. Examples1. Students remember more words when recalling them in the same location in which they were learnt than when in a different location.2. Recall of a story is affected by the length of time since hearing the story.
  8. 8. Experimental Process• Experiments are one of the most commonly used methods in psychology• An experiment is a research method in which the researcher – the experimenter – has a high degree of control.• The experimenter controls/manipulates the independent variable (IV) and measures the dependent variable (DV)
  9. 9. Example• If we were to conduct an experiment on whether television distracts students from studying, what would be the IV and the DV?HINT:Look for what is being measured (DV) first, IV is then easy to identify!
  10. 10. • Both IV & DV MUST be measurable = Operationalise• There are usually two values of the IV e.g. – Noise or no noise – Smoker or non-smoker – Male or Female• These determine the conditions of the experiment• The conditions can be arranged in several different ways (There can be more than 2 conditions)
  11. 11. Other variables• What else might affect the study?• Any variable (except for the IV) that can influence your findings = extraneous variablesE.g.Participant Variables = age, gender, experience, emotionSituational Variables = noise, light, time of day, crowds, interruptions
  12. 12. • If an extraneous variable is NOT controlled for and impacts the results = Confounding variable

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