An article titled “Giving the Finger to Dating Services” appeared in Chance magazine (2008) that investigated the association between length of index finger and height. This research was spurred by a report that online dating sites were asking members for the length of their index fingers. Perhaps this information could be used to verify whether the member was reporting his or her correct height on the profile? Th e 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. Enter the data into the Corr/Regression applet.

a. Identify the type of study: randomized experiment or observational study.
b. Identify the experimental/observational units in this study.
c. Identify the two variables of interest and whether each is categorical or quantitative. Which variable do you think makes more sense to use as the explanatory variable and which as the response variable?
d. Produce a scatterplot and comment on the association between the variables as revealed in the scatterplot. (Remember to comment on form, direction, strength, and unusual observations.)

e. Report the value of the correlation coefficient. Does the value of the correlation coefficient support your answer in part (d)? Explain how you are deciding.