Table 1. One-sided t test for the expected value of migration distance $\mathbf{\Delta }\overline{\mathit{Z}}$ in the caldera and SNB.

Null hypothesis H0	Sample size N	t statistic	P value	Decision
$\mathrm{\Delta }{\overline{Z}}_{\text{Caldera}}=0$	159	1.97	0.0255	Reject at 10% significance
$\mathrm{\Delta }{\overline{Z}}_{\text{SNB}}=0$	78	0.0797	0.468	Accept