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Terms in this set (19)
univariate data
A single set of numbers
bivariate data
Data given as pairs of numbers and show a relationship between the pairs
scatterplot
A graph the shows the relationship of bivariate data using point on the coordinate grid
trend
A relationship that exists between the two variables in a bivariate data set
positive correlation
A relationship where the value of one variable increases as the value of the other variable decreases
negative correlation
When the value of one variable decreases as the value of the other variable increases
causal relationship
When one variable causes a change in another variable
explanatory variable
In a casual relationship, the variable which causes the change in another variable
response variable
In a causal relationship, the variable which is affected by the explanatory variable
line of best fit
A line that approximates the points on a scatterplot which can be used to show a trend and make predictions; also called a linear regression or least squares line
linear regression line
A line that approximates the points on a scatterplot which can be used to show a trend and make predictions; also called a line of best fit or least squares line
domain
The set of all first elements, (x-values) of ordered pairs
range
The set of second elements (y-values) that correspond with a set of x-values (domain).
extrapolation
To predict corresponding variables outside of the domain.
correlation coefficient
Represented by r, it is a number between -1 and 1, inclusive, that is used to judge how closely a line fits the data
strong correlation
Correlation coefficients with an absolute value greater than 0.75
weak correlation
Correlation coefficients with an absolute value less than 0.3
moderate correlation
Correlations that are not strong or weak
interpolation
To predict corresponding variables within the domain
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