Refer to the previous exercises that investigated the association between length of index finger and height. The data file HeightAndFingerLength contains data on the height (inches) and the length of index finger of dominant hand (cm) for students in a statistics class.
a. Once again, using appropriate technology (applet or statistical soft ware) create a scatterplot of the data. On the scatterplot, locate the individual who reported a finger length of 10.16 cm and height of 78 inches. Does this individual appear to be an unusual observation? Explain you reasoning.
b. Next, report the correlation coefficient for these data.
c. Now, remove this individual (finger length of 10.16 cm and height of 78 inches). Recalculate the correlation coefficient for the data without this individual.
d. Did the correlation coefficient increase (move farther from zero) or decrease (move closer to zero) on the removal of the individual who reported a finger length of 10.16 cm and height of 78 inches? Explain why that makes sense.