
The study of how to collect, organize, analyze and interpret numerical info. from data.
Statistics

People or objects included in a study.
Individuals

A characteristic of the individual to be measure or observed.
Variable

Posses a value or numerical measurement for which operations such as addition or averaging make sense, such as height, weight, age, income...
Quantitative Variable

Posses a nonnumerical value such as gender, nationality, color, name...
Qualitative (Categorical) Variable

the set of all measurements or observations under consideration.
Population Data

A (representative) subset of the population
Sample Data

The lowest level of data measurement  Ex.  Name; color; social security number; telephone number; political party.
Nominal

The second lowest level of data measurement  Ex.  class (Freshmen, sophomore...); military rank, conditions (poor, good, excellent.)...
Ordinal

The second highest level of data measurement  Ex.  temperature (oC or oF); calendar date; clock time.
Interval

The highest level of data measurement  Ex.  Kelvin temperature; height, weight; income time;  Starts at 0  nothing below it.
Ratio

Involves methods of orgainizing, picturing and summarizing info from samples or populations.
Descriptive Statistics

Involves methods of using info from a sample to draw conclusions regarding the population
Inferential Statistics

