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Stats

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Updated 2007-02-13 22:20

Summary

Statistics info.

Definitions

DefinitionWord
The science of collecting, organization, and interpretation of data.Statistics
Collection, presentation and description of sample data. Things that describe the sample. Ex. All heights would be 68-69” tall.Descriptive Stats
Making decisions and draw conclusions about populations.Inferential Stats
The entire collection of objects or subjects.Population
A part/subset of the populationSample
A planned activity where the experimenter has control to impose a treatment.Experiment
After the fact data collection. No imposed treatment.Survey
Represented with a Greek letter. (ex. Alpha sigma beta cal) Population summaries (numerical)Parameter
A variable that categorizes or describes an element of a population.Qualitative
Attribute, categorical, USUALLY non-numerical, arithmetic is useless with thisQuality
Numerical in nature, arithmetic is useful (ex. Height, weight, age)Quantitative
Qualitative > Variable that order is implied. Ex. Rank in a race, small medium large, military rankingsOrdinal
Qualitative > Variable that order is not implied, hair colorNominal
Quantitative > Numerical value that takes on packets of numbers (count)Discrete Variable
Quantitative > All numbers in-between, like the real number system (measurement)Continuous Variable
The Number of standard deviations above or below the mean on a normal curve.Z-score
The data value such that at most k% o the data falls below.Percentile
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