Updated 2007-02-13 22:20


Statistics info.


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