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Analyze Survey Data AP units assigned to groups asthma baseline behavior biases bicycle helmets Case-control designs Circle one choice Cohort designs Cohort studies computerized concurrent controls conducted confounding variables control group controls and random Controls Without Random County Cross-sectional designs cross-sectional survey data collection DESIGN SURVEYS effects of innovation eligible employees Evaluation Exam experiment experimental and control experimental design experimental group External validity Food Allergy gestational age graduates headaches Historical controls illustrated in Example inclusion criteria infants Interactive effects Internal intervention interviews mailed Maturation measure Medical Center mental health months nonrandom assignment Objective observations outcome patients potential premeasure quality of UCLA's random assignment random numbers randomized controlled trial randomly constituted reactive effects reliable and valid responses schools Selection bias self-administered questionnaire Self-controls significantly small group discussion social statistical study designs survey designs target population tion Type B cohorts UCLA's education variables workshop