@Dumbstudent,

Not familiar with your particular stats package, but

this link explains how to test the slope of a least squares fit lit for significance.

**This number is almost certainly generated by your stats package**. The one I use shows the t value and the probability from that anytime you pull a least squares fit. The value of the t statistic that you find meaningful is up to you, but if you fit a line through four points, you have two degrees of freedom and

want a 95% confidence level, you need a t value of 4.3 or higher.

Quote:Test statistic. The test statistic is a t statistic (t) defined by the following equation.

t = b1 / SE

where b1 is the slope of the sample regression line, and SE is the standard error of the slope.

P-value. The P-value is the probability of observing a sample statistic as extreme as the test statistic. Since the test statistic is a t statistic, use the t Distribution Calculator to assess the probability associated with the test statistic. Use the degrees of freedom computed above.