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Controlling Extraneous Variables

Controlling Extraneous Variables. Filysia Setiawan Susan. The Validity of a study will be approached from four perspectives. Environmental Issues Grouping Issues People Issues Measurement Issues. Environmental Issues. Naturally occurring variables

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Controlling Extraneous Variables

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  1. Controlling Extraneous Variables Filysia Setiawan Susan

  2. The Validity of a study will be approached from four perspectives • Environmental Issues • Grouping Issues • People Issues • Measurement Issues

  3. Environmental Issues • Naturally occurring variables •  Environmental situation naturally will affect the variables although it is indirectly.

  4. Environmental Issues • Artificiality •  is surreptitiously alter the intentions of a study. •  Artificiality  Experimental mice • In which the conditions are artificial, as they would in the real world

  5. Grouping Issues • Self – selection • generally refers to the practice of letting the subjects decide which group to join. • Mortality •  refers to students who self-select themselves out of group by dropping out of the study for any number of reasons.

  6. Grouping Issues • Maturation Different individuals can have different experiences that cause them to mature or change over time.

  7. People Issues • Hawthorne effect • it happens if the result of investigation are more closely related to this pleasure than to anything that actually occur in the research. • Halo effect •  is due to the tendency among human beings to respond positively to a person they like.

  8. People Issues • Subject expectancy • occurs when the subjects think they have figured out what study is about.

  9. People Issues • Researcher expectancy • as Rosenthal showed can be a problem in behavioral research. • Is often controlled for with double blind technique in medical research.

  10. Measurements Issues • Practice effect essentially involves the potential influence of the measures on each other • Reactivity effect may occur when this measures themselves are causing a change in the subjects.

  11. Measurement Issues • Instability of measures and results • refers to the degree to which the result on the measure are consistent.

  12. Conclusion

  13. Conclusion

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