Question 10 2 pts A cognitive psychologist conducts a study of whether familiarity of words predicts the time it takes to press a button indicating whether the word is singular or plural. All participants are given the same words. Familiarity with these was related at a later time on a 10-point scale (higher = more familiar). Below are the scores for the first three participants. Familiarity Reaction Time Person Tested X A 9 1.92 B 2 12 6 1.5 What is the correct value for "a" in the linear regression equation