For a two-tail test, the null hypothesis will be rejected at the 0.05 level of significance if the value of the standardized test statistic z is:
a.) smaller than -1.96 or greater than 1.96
b.) smaller than 1.96 or greater than -1.96
c.) greater than 1.645 or less than -1.645
d.) greater than -1.96 or smaller than 1.96