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Find the critical value for different types of sample size and level of significance  

A paired difference experiment yielded and pairs of observations. In each case described below, what is the rejection region for testing H0: mean= 6 against Ha: mean >6. Utilize standard deviation = 8.1. 
a) nD = 43, a = 0.07 z> _ 
b) nD = 29, a = 0.01 
c) nD = 9, a = 0.03 t >

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