PSY 310 Study Guide - Midterm Guide: Observational Techniques, Likert Scale, Multiple Choice
30 Jul 2018
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Chapter 11: designing, conducting, analyzing, and interpreting experiments with more. Experimental design - the general plan for selecting participants, assigning participants to experimental conditions, controlling extraneous variables, and gathering data. Every experimental design is based on the two-group design. Can help answer more [sophisticated] questions and is more efficient. Decide how many ivs and groups will be used. Compares three or more levels of a single iv (levels, or treatment conditions: differing amounts or types of an iv used in an experiment). Assigning participants to groups - use either independent groups or correlated groups. Independent groups (between-subjects comparison) - groups of participants formed by random assignment. Random assignment - each participant has an equal chance of being in any group. (this is an important control procedure want to avoid a confounded experiment. ) For two independent-groups comparisons, df = n - 2. (n = number of subjects. ) Randomizing is simpler than measuring participants on some variable and then matching them.
