document.write( "Question 327333: What is the z-value for a two tailed hypothesis test on a population mean when alpha is 5%
\n" ); document.write( "a) z=1.65
\n" ); document.write( "b) z=1.96
\n" ); document.write( "c) z=2.33
\n" ); document.write( "d) z=2.58
\n" ); document.write( "Please explain so I can understand Thanks. \n" ); document.write( "
Algebra.Com's Answer #234504 by stanbon(75887)\"\" \"About 
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What is the z-value for a two tailed hypothesis test on a population mean when alpha is 5%
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\n" ); document.write( "Sketch a standard normal distribution curve
\n" ); document.write( "with z as its horizontal axis.
\n" ); document.write( "Sketch a 95% area centered on the mean value,
\n" ); document.write( "which is 0.
\n" ); document.write( "That leaves a left-tail of 2.5% on the left
\n" ); document.write( "and a right-tail of 2.5% on the right.
\n" ); document.write( "The cut-off point on the left and on the right
\n" ); document.write( "is 1.96 standard deviations from the center at
\n" ); document.write( "+1.96 and at -1.96.
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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\n" ); document.write( "\n" ); document.write( "a) z=1.65
\n" ); document.write( "b) z=1.96
\n" ); document.write( "c) z=2.33
\n" ); document.write( "d) z=2.58
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