1. Influential points

2. Outlier –
In a regression setting, an outlier is a data point with a large residual

3. Influential point- A point that influences where the LSRL is located
If removed, it will significantly change the slope of the LSRL

4. Racket Resonance Acceleration
(Hz) (m/sec/sec)
One factor in the development of tennis elbow is the impact-induced vibration of the racket and arm at ball contact.
Sketch a scatterplot of these data.
Calculate the LSRL & correlation coefficient.
Does there appear to be an influential point? If so, remove it and then calculate the new LSRL & correlation coefficient.

5. Which of these measures are resistant?
LSRL
Correlation coefficient
Coefficient of determination
NONE – all are affected by outliers