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Quantitative Research Quasi-Experimental Designs • Pretest-posttest • Survey Research Nonequivalent Control - Cross-Sectional Design Group Design • Longitudinal Survey • Time Series Designs – Trend Study • Single Subject Design – Cohort Study • Multiple Baseline – Panel Study Designs
Quantitative Quasi-Experimental Designs This family of research designs is characterized by non-random selection of subjects. ******* The following experimental designs are based on the problem statement: The effects of teaching method(s) on history achievement.
Quasi-Experimental Design #1 Pretest-Posttest Non-Equivalent Control Group Design Diagram Class #1 O X 1 O Class #2 O X O
Quasi-Experimental Design #2 Posttest-Only Non-Equivalent Control Group Design Diagram Class #1 X 1 O Class #2 X O
Quasi-Experimental Design #3 Time Series Design (Multiple Groups = Multiple Time Series Designs) Diagram Prete st Experimen tal Treatment Prete st Pretes t Postte st st Question Does exposure over a period of time have a lasting effect?
Time Series Design (example) Hypothesis: The use of a History Channel video as a teaching strategy will result in longterm retention of history knowledge. Histor y Test History Channel video Histor y Test
Quasi-Experimental: Single Subject A-B Design Single Subject methodology makes use of two conditions. The Baseline condition – A – and the Experimental Treatment condition – B and focuses on the behavior of an individual. O 1 Ok Ok+1 O 2 k X 1 Baseline Condition - A Experimental Condition - B
Quasi-Experimental: Single Subject/Multiple Baseline A-B-A-B Design The Multiple Baseline design allows one to study multiple effects & make multiple comparisons over time. O 1 Ok Ok+1 O 2 k+1 O 3 k+1 O 4 k X 1 Baseline Experimental Baseline Condition Treatment Condition -A Condition - B A Experimental Treatment Condition - B