Ch2_Student - Chapter 2: Psychological Research PSYCHOLOGY...

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Chapter 2: Psychological Research PSYCHOLOGY 120 Professor LeBreton Chapter 2 How Psychologists Do Research * Theory: * Hypothesis: EXAMPLES: * Operational Definition: *Defining a term from the hypothesis in a measurable way EXAMPLES: 1
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Research Methods *The scientific method employs different types of methods to conduct research. Each method has unique advantages and disadvantages. What method a researcher uses depends on what questions he/she is trying to answer. *All research is based on systematic observation and rules of evidence Descriptive Studies Descriptive Studies : a. Case Study: b. Observational Studies: c. Tests (assessments) *Standardized – *Norms – *Reliability – *Validity – *Surveys: self–report: 2
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Chapter 2: Psychological Research PSYCHOLOGY 120 Professor LeBreton o Problems with surveys: Population and Representative Sample Population: Representative Sample: Correlational Method *Correlation: (a descriptive method): *Correlation Coefficient: *Correlation coefficient can range from *A correlation coefficient of zero means 3
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* Positive Correlation : *(Ex. When one variable goes up, the other goes up OR when one variable goes down, the other goes down) *Example: the more broccoli you eat, the more antioxidants are in your blood (as the amount of broccoli goes up, the antioxidants
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This note was uploaded on 09/22/2011 for the course PSY 120 taught by Professor Donnely during the Spring '08 term at Purdue University.

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Ch2_Student - Chapter 2: Psychological Research PSYCHOLOGY...

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