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What is statistics?
The study of how to collect, organize, analyze, and intrpret numerical information from data.
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What are the people or objects included in a study?
Individuals
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What is a variable?
A characteristic of the individual to be measured or observed.
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What describes an individual by placing the individual into a category or group?
A Qualitative Variable
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What has a value or numerical measurment for which operations such as addition or averaging make sense?
A Quantitative Variable
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What is Population Data?
The data are from every individual of interest.
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What is Sample Data?
The date are from only some of the individuals of interest?
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What is a population parameter?
A numerical measure that describes an aspect of a population.
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What is a Sample Statistic?
A numerical measure that describes an aspect of a sample.
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Levels of Measurement:
Nominal level of measurement
- Applies to data that consist of names, lables, or catagories.
- There are no implied criteria by which the data can be ordered from smallest to largest.
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Levels of Measurement:
Ordianal level of measurement
- Applies to data that can be arranged in order
- Differences between data values either cannot be determined or are meaningless
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Levels of Measurement:
Interval Level of Measurement
- Applies to data that can be arranged in order
- Differences between data values are meaningful
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Levels of Measurement:
Ratio level of measurement
- Applies to data that can be arranged in order.
- Both differences between data value and ratios of data values are meaniful
- Data at the ratio level have a true zero
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What involves methods of organizing, picturing, and summarizing information from samples or population?
Descriptive Statistics
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What involves methods of using information from a sample to draw conclusions regarding the populuation?
Inferential Statistics
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What is a Simple Random Sample?
of n measurements from a population is a subset of the population selected in such a manner that every sample of size n from the population has an equal chance of being selected.
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What is a Simulation?
A numerical facsimile or representation of a real world phenomenon.
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