Volume Unit Lab

My claim is that all but one of the points (point 4) are similar in values and follow the line of regression but point 4 is an out liar. My reasoning for that is if you look at the graph all points other then point 4 are in a nearly straight line and then there is point 4 out lying that line. The equation I used was V=8.592(v)+0. Having my slope be 8.592 and my y-intercept be 0 because of the 5% rule.