VANESSA TRAINA HAIRSTYLES AND HAIRCUTS
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VANESSA TRAINA HAIRSTYLES on randomized block design (RBD) an approach to assigning participants to treatment conditions in which meaningful discrete strata within the sample (e.g., gender, experience) are used to identify homogeneous subsamples; individuals from each subsample or block are then assigned randomly to the different conditions. In this way, participants are initially matched on a blocking variable that the researcher wishes to control. The acknowledgment of heterogeneity within the sample enables the researcher to reduce within-group variance and to use that information when evaluating treatment effects. The variable on which participants are stratified is assessed prior to the study. randomized clinical trial (RCT) an experimental design in which patients are randomly assigned to a group that will receive an experimental treatment, such as a new drug, or to one that will receive a comparison treatment, a standard-of-care treatment, or a PLAcEBO. VANESSA TRAINA HAIRSTYLES 2016.