document.write( "Question 1082840: The heights of a random sample of 6 fifth - graders have a sample mean of 54.68 inches and a standard deviation of 4.42 inches. Compute a 90% confidence interval for all the fifth graders from this data.
\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #696926 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
\r\n" );
document.write( "On your TI-84,\r\n" );
document.write( "\r\n" );
document.write( "press STAT\r\n" );
document.write( "press right arrow twice to highlight TESTS\r\n" );
document.write( "scroll down to 8:TInterval...\r\n" );
document.write( "press ENTER\r\n" );
document.write( "\r\n" );
document.write( "         TInterval    \r\n" );
document.write( "     Inpt:Data Stats    <--Highlight Stats\r\n" );
document.write( "     x:54.68\r\n" );
document.write( "     Sx:4.42\r\n" );
document.write( "     n:6\r\n" );
document.write( "     C-Level:0.90\r\n" );
document.write( "     Calculate          <--Highlight Calculate\r\n" );
document.write( "\r\n" );
document.write( "It takes a few seconds to calculate. You'll see:\r\n" );
document.write( "\r\n" );
document.write( "        TInterval\r\n" );
document.write( "    (51.044,58.316)\r\n" );
document.write( "    x=54.68\r\n" );
document.write( "    Sx=4.42\r\n" );
document.write( "    n=6\r\n" );
document.write( "\r\n" );
document.write( "The answer is (51.044,58.316) or 51.044 < x < 58.316\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );