A cognitive psychologist conducted a study of whether familiarity of words (X) predicts the time it takes (in seconds) to press a button indicating whether the word is singular or plural (Y), with all participants being given the same words. Familiarity with these words was rated at a later time on a 7-point scale (with higher numbers indicating more familiarity). The participants' scores were: ​​X​ Y​
​​6 ​ 0.3
​​2​ 1.5
​​5​ 0.8
​​3​ 1.4​
​​M = 4 ​M = 1
a. Figure the linear prediction rule, list the b value, a value and the final formula.
b. Make a graph with the regression line.