Question 367477
What critical region(s) for z would be used to test the hypotheses: 
H0:µ = 10 
Ha:µ is not equal to 10,
for alpha = 0.025 ?
-----
Ha implies you have a two-tail test
That gives you two tails with alpha/2 = 0.0125
----
The z-values with a left/right tail of 0.0125 = +-2.2414
I used a TI-84 to get those values: "invNorm(0.0125)"  
----
CV: z< -2.2414 or z > +2.2414
That means you will reject Ho if z< -2.2414 or z> 2.2414
===================================================================

State the null hypothesis Ho and the alternative hypothesis Ha that would be used for a hypothesis test related to each of the following statements: 
The mean weight of packages shipped on Air Express during the past month was less than 36.7 lb.
Ho: u >= 36.7
Ha: u < 36.7
=================
Cheers,
Stan H.