Question 437320
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Hi
critical values for a two tailed test with a=0.02
 z<-2.575	z >+2.575
{{{drawing(400,200,-5,5,-.5,1.5, graph(400,200,-5,5,-.5,1.5, exp(-x^2/2)), green(line(-2.575,0,-2.575,exp(-2.575^2/2)),line(2.575,0,2.575,exp(-2.575^2/2))),locate(4.8,-.01,z),locate(4.8,.2,z))}}}

	a	a/2	crtical regions	
90%	0.1	5%	z <-1.645	z >+1.645
95%	0.05	2.50%	z <-1.96	z >+1.96
98%	0.02	1%	z <-2.33	z >+2.33
99%	0.01	0.50%	z<-2.575	z >+2.575