APA 2180 Lecture Notes - Lecture 14: Statistical Parameter, Statistic, Decision Theory
20 Mar 2019
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Document Summary
Stats: an objective way of interpreting a collection of observations. Central tendency : a single score that best represents all the scores e. g. mean, median, mode. Variability:: the degree of difference between each individual score and the central tendency score. Random sampling is the best, as each person has an equal chance at being selected. There should be a balance between how big the sample is and its feasibility. Population parameter is estimated by the data (sample size and feasibility. After the population parameter has been estimated this new found information is called a statistic. Combines how feasible it is to test population, on time and money. Stratified random divided on a characteristic before random sampling. Convenience sampling based on availability of volunteers. Post-hoc explanation justifying sample representativeness when no random selection. Left side of the group is group 1, right side of the group is group 2.
