Biology 2244A/B Lecture 2: Study Designs Lecture
26 Sep 2018
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Study designs lecture: control versus control group - in chapter 7, the box titled "experimental group, It really should have "control group" in bold, not just "control". Be aware that "control" is a much larger concept than a. A control group is a group of subjects/units in your study that serve as a baseline with which other experimental groups are compared; these control groups typically don"t receive any kind of experimental manipulation. Random sampling is a method of obtaining the subjects/units that will participate in your study; it is a sampling strategy/design. Randomization (i. e. when we randomize) is a technique we use to assign subjects/units to treatments; it is a study design procedure. They are not the same thing: replication - your textbook unfortunately uses "replication" to refer to the situation in which we repeat a study a second (or third or) time on a new sample of individuals.
