CMN 2101 Lecture Notes - Lecture 2: Dependent And Independent Variables, Sampling Frame, Control Variable
Document Summary
Experimental research designs allows: the researcher to observe causation - looking for cause and effect. Ex: will i get cancer (dependent var. ) if i continue to smoke (ind. var. : control more accurately for internal validity, causation hinders on 3 conditions: Temporal order changes in the independent variable (iv) must occur before the dependent variable (dp) As values in the iv increase, the dv measures vary. Nothing but the treatment variable/iv must influence the. Dv: generate hypothesis - statement you intend to prove or disprove, find a sampling frame - select a sample size, random assignment - assign the sample size to groups randomly. Experimental group - also known as treatment group: pretest - record information ex: servers - see the amount of tips before making changes. Iv that would have an effect on the dv: causal factor in change of dependent variable is solely on the, threats to internal validity: manipulation of independent variable.