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STA_Notes_8.20.07

# STA_Notes_8.20.07 - STA Class Why Do You Need To Study...

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STA Class 23:53:43 Ch. 1 – Why Do You Need To Study Statistics? 1. To learn methods of Data collection 2. Data Analysis 3. Understanding of journal articles and news stories. Data The observation gathered through methods such as surveys, experiments, direct observation of behavior, or recorded information. Consists of measurements on characteristics of interest (variables). Statistics Consists of a body of methods for collecting and analyzing data. Definitions Two Elements of Statistical Analysis o Descriptive Statistics – Summary description such as measure of center and variation (used to describe data) o Inferential Statistics – Drawing conclusions about the population, based on a sample. The 5 Fundamental Elements of Statistics 1. Population – Set of all units 2. Variable – Characteristic of an individual population unit (quantitive or qualative) 3. Sample – Subset of the population 4. Inference – Say something about the population based on a randomly chosen sample.

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