Among the options you provided, the correct definition is:
"Observed data points that are far from the least squares line."
What is it about?
In the context of regression analysis, an influential point refers to an observed data point that has a significant impact on the parameters of the regression model. These points can strongly influence the slope or intercept of the least squares line. Influential points are typically outliers that exert a disproportionate influence on the estimated regression coefficients.
Therefore, among the options you provided, the correct definition is:
"Observed data points that are far from the least squares line."