# Statistics Lecture 1 Flashcards

Statistics

The science of assembling, classifying, tabulating, and analyzing data of a numerical nature to present significant information about a given subject.

Main branches of statistics

- Descriptive statistics
- Inferential statistics

Descriptive statistics

a way of summarizing data from a population or a sample.

Inferential statistics

Comparison of data, extrapolation…

Data

A collection of information. A set of values of qualitative or quantitative variables.

Types of data

- Qualitative
- Quantative

Quantitative data

Numeric date

Qualitative data

Non-numeric date

Observation

Entity whose characteristics we measure

Measurement

Assigning numbers to observations according to pre-set rules

Variable

A measurement characteristic that can have various values or levels

Types of variables

- Qualitative(categorical) = Non numerical
- Quantitative = Numerical

Types of quantitative variables

- Discrete
- Continuos

Types of qualitative variables

- Binary
- Nominal
- Ordinal

Continuos:

- Quantitative
- Not restricted to taking specified values