Determine the critical regions and critical values for z that would be used to test the null hypothesis at the given level of significance as described in each of the following.

A.  HO: u = 73      Ha: u does not equal 73          a = 0.01

B.  Ho: u > or = 90      Ha: u  < 90                                   a = 0.10

C.  Ho: u < 43        Ha:  u > 43                                  a = 0.05
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