: <p>

A.  Assume the null hypothesis is true.  Then, if the test
just made is repeated, the chances that its z-value will be
less than or equal to -2 is about 2.5%  <p>

B.  The chance that the null hypothesis is true is about
 	
 2.5%.  <p>

Then <p>

a.  A is true, but B is not necessarily true  <p>

b.  B is true, but A is not necessarily true  <p>

c.  A and B are both true  <p>

d.  neither A nor B are necessarily true