A variable that takes numerical values for which arithmetic makes sense, for example, counts, temperatures, weights, amounts of money, etc. For some variables that take numerical values, arithmetic with those values does not make sense

In statistics and quantitative research methodology, levels of measurement or scales of measure are types of data that arise in the theory of scale types developed by the psychologist Stanley Smith Stevens. The types are nominal, ordinal, interval, and ratio.

a small part or quantity intended to show what the whole is like.

In statistics and quantitative research methodology, levels of measurement or scales of measure are types of data that arise in the theory of scale types developed by the psychologist Stanley Smith Stevens. The types are nominal, ordinal, interval, and ratio.

In statistics, ordinal data is a statistical data type consisting of numerical scores that exist on an ordinal scale

Data that is divided into ranges and in which the distance between the intervals is meaningful.

In statistics and quantitative research methodology, levels of measurement or scales of measure are types of data that arise in the theory of scale types developed by the psychologist Stanley Smith Stevens. The types are nominal, ordinal, interval, and ratio.

Descriptive statistics is the discipline of quantitatively describing the main features of a collection of data, or the quantitative description itself. 

In statistics, statistical inference is the process of drawing conclusions from data that are subject to random variation, for example, observational errors or sampling variation.

a function that represents the distribution of many random variables as a symmetrical bell-shaped graph.

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   a quantity calculated to indicate the extent of deviation for a group as a whole.

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   a graph in which the values of two variables are plotted along two axes, the pattern of the resulting points revealing any correlation present.

a mutual relationship or connection between two or more things.

a number between -1 and +1 calculated so as to represent the linear dependence of two variables or sets of data.

In statistics, the coefficient of determination, denoted R² and pronounced R squared, indicates how well data points fit a line or curve. 

remaining after the greater part or quantity has gone.

the relationship between cause and effect; causality.

a smooth curve fitted to the set of paired data in regression analysis; for linear regression the curve is a straight line

Any variable that explains the response variable. Often called an independent variable or predictor variable.

calculation of the value of a function outside the range of known values

a message (spoken or written) that is introduced or inserted; "with the help of his friend's interpolations his story was eventually told"; "with many insertions in the margins

a message (spoken or written) that is introduced or inserted; "with the help of his friend's interpolations his story was eventually told"; "with many insertions in the margins"