Unit one Prob and stats vocabulary

Statistics

the science of conducting studies to collect, organize, summarize, analyze, and draw conclusion from data

Variable

A characteristic or attribute that can assume different values and describe a situation

Data

The raw material that is collected by making observations, taking measurements, counting, or asking questions. The measurements or observations that the variables can become.

Data set

A collection of data values

Descriptive statistics

The collection, organization, summarization, and presentation of data

Inferential statistics

Generalizing data from samples to populations, performing estimations hypothesis tests, determining relationships among the variables and making predictions

Population

all subjects are being studied

Sample

A group of subjects selected from a population

Qualitative variables

a variable can be placed into distinct categories, according to some characteristic or attribute

Quantitative variables

a variable that is numerical in nature and that can be ordered or ranked

Discrete variables

a variable that assumes values can be counted

continuous variables

a ariabe that an assume a values between any two specific values. A values obtained by measuring

Nominal

Classifies data into mutually exclusive categories in which no order or ranking can be imposed on the data. LABELS

Ordinal

Classifies data into categories that can be ranked, differences between ranks do not exist

Interval

Ranks data and precise difference between units of measure NO TRUE ZERO

Ratio

Possessed all the characteristics of interval measurement and TRUE ZEROS EXIST