document.write( "Question 220856: what is the critical value zc necessary to form a confidence interval at the given level of confidence 85% \n" ); document.write( "
Algebra.Com's Answer #165710 by stanbon(75887)\"\" \"About 
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what is the critical value zc necessary to form a confidence interval at the given level of confidence 85%
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\n" ); document.write( "You need 15% evenly divided between two tails.
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\n" ); document.write( "I used a TI-84 to find invNorm(0.15/2) = -1.4395
\n" ); document.write( "The cv's are +/-1.4395
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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