10.26. For the student survey data (Exercise 1.11), are there any pairs of variables for which you expect the association to disappear under control for a third variable? Explain.

10.27. Using the most recent GSS, construct a contingency table relating gender (GSS variable SEX)

and party identification (PARTYID). Is there still a gender gap? Control for political ideology

(POLVIEWS) by forming partial tables for the most conservative and the most liberal subjects.

Does the association seem to persist for these subjects?