Statistical Sciences 1023A/B Lecture Notes - Lecture 6: Block Design, Dependent And Independent Variables
29 Mar 2017
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Variables characteristics that can take on different values o. Explanatory variable thought to have an influence or effect on the response variable o. Treatment one or a combination of categories of an explanatory variable assigned by the researcher o. The amount of coffee assigned to an individual to drink. Observational study differences in explanatory variable(s) are observed" and recorded in relation to difference in the response variable: no manipulation by researcher o. Observation of differences in physical activity exertion and how it relates to longevity. Experiment explanatory variable(s) are manipulated or assigned by the researcher, and the effect on response variable(s) is observed: differences among groups are created by the researcher o. Assigning some people to use laptops, others to sit near people with laptops, and others to sit away from people with laptops, &comparing all their test scores. Completely randomized design units from the sample are randomized to one of the treatment groups o.
