Scientific Methods Chapter 2 Psychology 301.

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Presentation transcript:

Scientific Methods Chapter 2 Psychology 301

Basic Steps for Conducting Scientific Research Step 1: Formulate a hypothesis 1. Step 4: Report the results Step 2: Design a study Step 3: Collect & analyze data

The Scientific Process Theory Revise Theory Hypotheses Empirical Tests Replicate Not Supported Supported Confidence in theory decreases Confidence in theory increases Discard Theory

Types of psychological research Experimental Research Experiments Descriptive/Correlational Research Surveys Observation Naturalistic Contrived Case Studies

Experiments Experiments - Do changes in one variable (X) cause changes in another variable (Y)? Independent Variable (X) condition or event that is manipulated by experimenter Dependent Variable (Y) variable that is affected (hopefully) by manipulating independent variable Extraneous Variable(s) any variable other than independent variable that may influence dependent variable

Example A study was conducted to examine the effects of temperature on aggression. Participants were randomly assigned to one of three conditions (low [70o-72o], moderate [80o-82o], or a high [90o-92o] temperature room). While in the room an assistant irritates the participants. Participants were later given a chance to “evaluate” the assistant and told that low ratings would cause the assistant to be fired.

Research Methods

Research Methods Confounding of Variables occurs when independent and extraneous variables are linked together makes it impossible to tell which variable affected dependent variable

Research Methods Minimize confounding with consistent procedures Minimize confounding with random assignment participants have an equal chance of being assigned to any group or condition in the study. the goal of random assignment is to equally distribute potential extraneous variables in each group.

Variations in experimental design Use 1 group of participants who act as their own control group (e.g., expose each participant to each temperature) Manipulate more than 1 independent variable at a time (temperature & humidity) Measure more than 1 dependent variable at a time (aggression & helping)

Pros and Cons Advantages of Experimental Research Allows conclusions about cause & effect relationships between variables Disadvantages of Experimental Research Experimental conditions are artificial do results “generalize” to the real world? Some questions can’t be tested in an experiment

Correlation/Descriptive Research Advantages Study phenomena that can’t be studied in a lab riots effects of supervisor behavior on employees effects of job loss on couples’ relationship quality effects of smoking on physical health Very realistic results can be generalized to other settings Disadvantages less control over extraneous variables difficult to measure behavior as precisely (compared to lab experiments) cannot demonstrate cause and effect relationships

Correlation The extent to which one variable can be understood on the basis of another Two properties of correlation coefficient direction (positive or negative) magnitude (strength of the relationship)

Positive Correlation r = .95

No Correlation r = .00

Negative Correlation High r = -.95 Low Low High

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