I am reading Introduction to Statistical Learning by James et al (freely available on their website). In the section the quote below is taken from, they illustrate how $t$-statistic is used to test the null hypothesis.
Now, I understand the definition of the $t$-statistic. But, I am having trouble wrapping my head around the definition of the $p$-value; particularly, in the quoted text below, which value are they exactly talking about?
Consequently, it is a simple matter to compute the probability of observing any value equal to $|t|$ or larger, assuming $\beta_1 = 0.$
In other words, I would like to know how, in Table 3.1, p.68, the $p$-value obtained?