Quantatative Psych

Descriptive statistics

describe or characterize the obtained data: mean, SD, range

Inferential Statistics

uses the obtained data to infer to the population

Population

complete set if individuals, objects, or scores

Sample

subset of a population

Data

measure on subject

Statistic

number calculated on sample data

Parameter

number that describes some characteristic of a population.

Nominal

units are categories

Ordinal

ranking according to whether they posess more, less, or the same amount of the variable being measured

Interval

posess the properties of magnitude and equal intervals between adjacent units

ex: IQ scores, SAT Scores, time of day

Ratio

measures variables on a continuous scale, with an equal distance between adjacent values

ex: weight, height, age, distance