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1.1 An Overview of Statistics
Statistics is the science of collecting, organizing, analyzing, and interpreting data in
order to make decisions.
Data consist of information coming from observations, counts, measurements, or
A population is the collection of ALL outcomes, responses, measurements, or counts
that are of interest.
A sample is a subset of a population.
A parameter is a numerical description of a population characteristic.
A statistic is a numerical description of a sample characteristic.
Two Branches of Statistics:
1. Descriptive statistics – involves the organization, summarization, and display of data
2. Inferential statistics – involves using a sample to draw conclusions about a
population. A basic tool in the study of inferential statistics is probability.