You can put this solution on YOUR website! What is the Z-critical at the 95% level of confidence (AKA the .05 level of significance)?
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If the test is two-tail the CV is +/-1.96
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If the test is left-tail the CV is invNorm(0.05) = 1.645
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If the test is right-tail the CV is invNorm(0.95) = -1.645
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Cheers,
Stan H.
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