Remove two references to Chapter 8 content.
Rewrite question since a reference was broken.
Removed stale references in Chapter 4 "Foundations for inference"
Removed stale references in Chapter 5 "Inference for numerical data"
Removed stale references in Chapter 6 "Inference for categorical data"
Removed stale references in Chapter 7 "Introduction to linear regression"
Revise citations. Occasionally run

$ biber main

to generate a new main.bbl from main.bcf. Then regenerate pdf couple times.
Remove foreign character in citation that was causing problems.
Output from previous commit -- citation fixed by removing foreign character.
Newest PDF. Problem: All figure/table references are goofed up. Captions are all even. References are all odd.