14 terms

Bivariate Statistics

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Time series data
Sequential numerical data gathered over time, for example: Income each month, daily rainfall or a patient's temperature taken each 30 minutes.
Linear
In a straight line. A linear equation, when graphed, will be a straight line.
Variable
A letter or other symbol taking the place of a number. A variable does not necessarily represent just one specific number; it can represent many different values.
Bivariate data
Data that is collected in pairs.
Scatterplot
A graph using points to show the relationship between two sets of data or two variables.
Correlation
The relationship between two or more values or variables.
Outlier
In a set of data, any value that is much larger or much smaller than the rest of the data.
Trendline
A line on a graph showing the general direction that a group of points seem to be heading.
Y = mx + c
The equation of a straight line.
Interpolation
An estimation of a value inside the range of observed or recorded data.
Extrapolation
An estimation of a value outside the range of observed or recorded data.
Linear regression
A technique to model the relationship between two variables by fitting a straight line equation to observed data.
Least squares regression
A more accurate technique to find the line of best fit, however it is affected by outliers in the data set.
3 median regression
A technique to find the line of best fit, that is not affected by outliers in the data set.