Psychology Statistics

Data and Statistics

Data

It consists of information coming from observations, counts, measurements, or responses.

Statistics

Is the science of collecting, organizing. analyzing, and interpreting data in order to make decisions

Population

Is the collection of all outcomes, responses, measurement, or counts that are of interest.

Sample

Is a subset of a population

Parameter

Is a numerical description of a population characteristics

Statistics

Is a numerical description of a sample characteristics

Descriptive Statistics and Inferential Statistics

Two major branches in studying Statistics

Descriptive Statistics

Involves the organization, summarization. and display of data

Inferential Statistics

Involves using a sample to draw conclusions about a population

Nominal, Ordinal, Interval, Ratio

The four levels of Measurement

The level of Measurement

It determines which statistical calculations are meaningful.

NOMINAL

Calculated using names, labels, or qualities. No mathematical computations can be made at this level.

Qualitative Only

Data at the Nominal level of measurement are…