document.write( "Question 170987: The following data represents the age (in weeks) at which babies first crawl based on survey of 12 mothers:\r
\n" ); document.write( "\n" ); document.write( "52, 30, 44, 35, 26, 47, 37, 56, 39, 26, 39, 28\r
\n" ); document.write( "\n" ); document.write( "Assume that the data comes from a normal distribution. Conduct a 95% confidence interval for the mean age at which a baby first crawls.
\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #126230 by stanbon(75887) $\"\"$ $\"About$

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The following data represents the age (in weeks) at which babies first crawl based on survey of 12 mothers:
\n" ); document.write( "52, 30, 44, 35, 26, 47, 37, 56, 39, 26, 39, 28
\n" ); document.write( "Assume that the data comes from a normal distribution. Conduct a 95% confidence interval for the mean age at which a baby first crawls.
\n" ); document.write( "---------------
\n" ); document.write( "x-bar = 38.25
\n" ); document.write( "s = 10.00
\n" ); document.write( "=============
\n" ); document.write( "E = 1.96*10/sqrt(12) = 5.65
\n" ); document.write( "----------
\n" ); document.write( "95% CI:
\n" ); document.write( "38.25-5.65 < u < 38.25+5.65
\n" ); document.write( "simplify
\n" ); document.write( "==================
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "

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