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Unit 3: Science of Psychology

Understand the purpose, strengths, and weaknesses of descriptive, correlational, and experimental research methods in psychology. Learn how to differentiate between case studies, naturalistic observation, surveys, and more.

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Unit 3: Science of Psychology

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  1. WHS AP Psychology Unit 3: Science of Psychology Essential Task 3-4: Differentiate types of Research with regard to purpose, strengths and weaknesses -Descriptive Research: Case Studies, Naturalistic Observation and Surveys -Correlational Research -Experimental Research

  2. Growth of Psych Approachesto Psych The Science of Psychology Ethics ResearchMethods Statistics Sampling Descriptive Correlation Experiment Descriptive Inferential Naturalistic Observation Case Study Central Tendency Variance Survey Careers We are here

  3. Essential Task 3-4: Outline • Hypothesis vs. Theory • Types of Research • Descriptive • Purpose • Strengths and Weaknesses • 1. Case Studies • 2. Surveys • 3. Naturalistic Observation • Correlational • Purpose • Strengths and Weaknesses • Experimental • Purpose • Strengths and Weaknesses

  4. Hypothesis is a testable prediction that lets us accept, reject or revise a theory. If families do not stress gender differences then there will be fewer sex differences in siblings. Hypothesis

  5. Theory isan EXPLANATION based on evidence that PREDICTS behaviors or events. A Theory must: 1. Fit the known facts 2. Predict new discoveries 3. Be falsifiable 4. be simple. The simpler the better – Occam’s Razor Theory

  6. Start with observations • Observe and describe the world with descriptive research • Form a hypothesis from your observations • Test your hypothesis. • Re-test your hypothesis • Then test it gain. • If it holds up you have a theory

  7. 1. Observe the physiological reactions to fear • Pupils dilate • Flushing • Breathing increases • Heart beat increases • Sphincters release

  8. 1. Form Hypothesis from your observations If humans have a physiological reaction to a stimulus, they will experience an emotion. (James-Lange Theory of Emotion)

  9. Descriptive Research • Purpose – To describe what is in reality • Strengths • Certain descriptive research methods can be quick • You can generalize (apply to more than just those from which you sampled) your findings with some descriptive research methods • Weaknesses • Can’t help you predict • Can’t give you cause and effect • Each descriptive research method has their own weaknesses as well

  10. 3 Types of Descriptive Research • Naturalistic Observation • Survey • Case Studies

  11. Correlational Research • Purpose – to show relationship between two variables. • Strength – If you know how they are related you can predict outcomes. • Weakness – Correlation is not causation.

  12. Experimental Research • Purpose – to establish cause and effect relationships between variables. • Strength – You find out if one variable (IV) causes a change in another variable (DV) • Weakness – Confounding variables, experimenter bias, etc.

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