notes515fall10chap1-2 - STAT 515 - STATISTICAL METHODS...

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STAT 515 --- STATISTICAL METHODS Statistics : The science of using data to make decisions and draw conclusions Two branches : Descriptive Statistics : ± The collection and presentation (through graphical and numerical methods) of data ± Tries to look for patterns in data, summarize information Inferential Statistics : ± Drawing conclusions about a large set of individuals based on data gathered on a smaller set ± Example: Some Definitions Population : The complete collection of units (individuals or objects) of interest in a study Variable : A characteristic of an individual that we can measure or observe Examples:
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: A (smaller) subset of individuals chosen from the population ± In statistical inference, we use sample data (the values of the variables for the sampled individuals) to make some conclusion (e.g., an estimate or prediction) about the population. Example: How reliable is this generalization to the population? For inference to be useful, we need some genuine measure of its reliability. Types of Data : Quantitative (Numerical) Data : Measurements recorded on a natural numerical scale (can perform mathematical operations on data). Qualitative (Categorical) Data
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This note was uploaded on 12/14/2011 for the course STAT 515 taught by Professor Zhao during the Spring '10 term at South Carolina.

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notes515fall10chap1-2 - STAT 515 - STATISTICAL METHODS...

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