Find the critical value zα/2 eeded to construct a(n) 80% confidence interval.
2.10
0.84
1.08
1.28
critical value 80% confidence interval is zalpha/2=z0.1=1.28( in excel NORMSINV(.1))
or in normal table look for 0.1
Find the critical value zα/2 eeded to construct a(n) 80% confidence interval.
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Find the critical value zα/2 that corresponds to the given confidence level 85%
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