Related Experiment Videos

A randomized trial of coached versus uncoached maternal pushing during the second stage of labor

Steven L Bloom1, Brian M Casey, Joseph I Schaffer

  • 1Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas, TX, USA.

American Journal of Obstetrics and Gynecology
|January 4, 2006
PubMed
Abstract

Related Concept Videos

Randomized Experiments01:13

Randomized Experiments

The randomization process involves assigning study participants randomly to experimental or control groups based on their probability of being equally assigned. Randomization is meant to eliminate selection bias and balance known and unknown confounding factors so that the control group is similar to the treatment group as much as possible. A computer program and a random number generator can be used to assign participants to groups in a way that minimizes bias.
Simple randomization
Simple...
Blind Procedures02:07

Blind Procedures

Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which child was...