stats unit2

examining relationships

between several variables for the same population

explanatory

denote by x

response

denoted by y

scatterplots

displays two quantitative variables measured on the sae individuals

lurking variable

helps explains the relationship between variables in a study

regression line

a straight line that describes how a response variable Y changes as an explanatory variable X changes

residual

the difference between predicted values of y (dependent variable) and observed values of y

extrapolation

the process predicting a value of Y for a value of X outside our range of data
- should be avoided all time

influential observation

bservation for a statistical calculation whose deletion from the dataset would noticeably change the result of the calculation.