TAILIEUCHUNG - Lecture Communication research: Asking questions, finding answers (4/e): Chapter 7 - Joann Keyton

Chapter 7 - Quantitative research designs. After reading this chapter, you should be able to: Select and develop the appropriate research design for your hypotheses or research questions; understand the strengths and limitations of each design form as it relates to research fi ndings, and argue for your design choices; explain the benefi ts of experimental forms over quasi-experimental and descriptive forms;. | Quantitative Research Designs Chapter 7 The experimental framework Used to determine causation Conducted in lab or other controlled setting To control for extraneous influences Independent variable is manipulated by researcher Participants randomly assigned to conditions or treatments Classical experiment Researcher controls Selection of treatment & control groups – based on theory Random sample Random assignment of participants to conditions – ensures participants in each condition are equivalent before any treatment Manipulation checks Posttest experimental design Pretest-posttest Factorial design Treatment groups based on two or more independent variables Dependent variable measured once after treatment given Can test for main and interaction effects Longitudinal experimental design Multiple measurements of the dependent variable across time Time 1→ Time 2 → Time 3 Time between measurements depends on the nature of the communication phenomenon studied Used for studying training .

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