t- stat=0

P(T<=t) one tail= 0.5

t-Critical one tail=6.31375

P(T<=t) two tail= 1

t - Critical two tail= 12.706205

Here P value = alpha

0.5 = 05 For one tail test

How does it relate to this? when a p-value is = alpha, what does that mean? why does .5=05 for a one tailed test?