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convenience samples
any process for selecting a sample of individuals or cases that is neither random nor systematic but rather is governed by chance or ready availability
Sampling Bias
collection of samples that do not accurately represent the entire group
Quantative Measures
are those that are counted and expressed by a numeric value
Qualilative Measures
described based on their observable features
Meta Analysis
examination of data from a number of independent studies of the same subject, in order to determine overall trends.
Effect Size
the raw data in meta-analysis studies because they are standardized and easy to compare