document.write( "Question 1177941: You measure 22 textbooks' weights, and find they have a mean weight of 73 ounces. Assume the population standard deviation is 12.9 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight.\r
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Algebra.Com's Answer #807112 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi\r\n" );
document.write( "Normal Distribution: σ = 12.9\r\n" );
document.write( "Sample:  n = 22, x̄ = 73\r\n" );
document.write( "90% confidence interval: two-sided(df= 21), t = 1.72\r\n" );
document.write( "ME =\r\n" );
document.write( "ME = = 4.7\r\n" );
document.write( "73 - 4.7<  < 73 + 4.7\r\n" );
document.write( "CI: ( 68.3, 77.7) \r\n" );
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document.write( "Wish You the Best in your Studies.\r\n" );
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