Bias is about systematic effects that skew your results in one way or another.
Used in Chap. 13: pages 157, 160, 163; Chap. 14: page 170
Also used in hcistats2e: Chap. 1: page 17; Chap. 3: pages 30, 31, 32, 33, 37, 39, 40; Chap. 4: page 52; Chap. 5: page 63; Chap. 8: page 91; Chap. 9: page 107; Chap. 10: page 120; Chap. 11: pages 127, 129; Chap. 12: page 137