document.write( "Question 1198519: Assume that a sample is used to estimate a population mean
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\n" ); document.write( " . Find the 90% confidence interval for a sample of size 67 with a mean of 42.3 and a standard deviation of 14.1. Enter your answer as an open-interval (i.e., parentheses) accurate to 3 decimal places.\r
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Algebra.Com's Answer #832138 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "    =  = 2.837 ( accurate to 3 decimal places)\r\n" );
document.write( "42.3-2.837 <  < 42.3 + 2.837\r\n" );
document.write( "CI(39.463, 45.137)\r\n" );
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document.write( " = CI	z = value\r\n" );
document.write( "90%	z =1.645\r\n" );
document.write( "92%	z = 1.751\r\n" );
document.write( "95%	z = 1.96\r\n" );
document.write( "98%	z = 2.326\r\n" );
document.write( "99%	z = 2.576\r\n" );
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