Calculate the p-value for the following conditions and determine whether or not to reject the null hypothesis:
a) one-tail test, Zx= 1.46, and a = 0.10
b) one-tail test, Zx = -2.48, and a = 0.01
c) two-tail test, Zx= -1.92, and a = 0.01
d) two-tail test, Zx = 2.76, and a = 0.02