Find the critical value zα/2 that corresponds to the given confidence level. 98%
zα/2 = _______
Given :
98% confidence level
c = 0.98
Using Excel function ,
= NORMSINV( 0.01 )
= -2.33
as confidence interval is two tailed , we can take this as positive .
So
Therefore the critical value that corresponds to the given confidence level is
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