Psychology Statistics

Descriptive Statistics

Organizing or summarizing data. Uses numbers and graphs

Inferential Statistics

Uses data to come to conclusions about the population

Measures of Central Tendency

Mean, Median, Mode; often associated with descriptive statistics

population

collection of all items of interest to study; denoted as “N”

sample

subset of population; denoted as “n”

Parameters

measurable characteristics of a population

statistics

measurable characteristics of a sample

Qualitative Data

data that is about qualities or categories

quantitative data

data that is about numbers

Nominal data

qualitative data with no orders, i.e. car makes

Ordinal Data

qualitative data with order, i.e. disgusting, neutral, delicious (about food)

ratio data

quantitative data with a meaningful “0” i.e. length

interval data

quantitative data without a meaningful “0” i.e. temperature