document.write( "Question 1184232: Using the 95% confidence level and the writing scores 91,91, 94, 91, 90, 81, 84, 91, 92, 91, 91, 98, 94, 91, 85, 91 you would expect the upper end of the confidence interval to be approximately what value? \n" ); document.write( "
Algebra.Com's Answer #814764 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "91, 91, 94, 91, \r\n" );
document.write( "90, 81, 84, 91, \r\n" );
document.write( "92, 91, 91, 98, \r\n" );
document.write( "94, 91, 85, 91\r\n" );
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document.write( "On your TI-84\r\n" );
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document.write( "Press STAT\r\n" );
document.write( "Press 1\r\n" );
document.write( "Enter all 16 numbers above into L1\r\n" );
document.write( "When you have them all entered,\r\n" );
document.write( "Press STAT again\r\n" );
document.write( "Press the right arrow key to highlight CALC\r\n" );
document.write( "Press 1:1-Var Stats\r\n" );
document.write( "The screen reads\r\n" );
document.write( "\r\n" );
document.write( "         1-Var Stats\r\n" );
document.write( "     List:L1\r\n" );
document.write( "     FreqList:\r\n" );
document.write( "     Calculate    \r\n" );
document.write( "\r\n" );
document.write( "Press the down arrow key twice to highlight Calculate\r\n" );
document.write( "Press ENTER\r\n" );
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document.write( "Read\r\n" );
document.write( "         1-Var Stats\r\n" );
document.write( "      x̄=90.375\r\n" );
document.write( "      Σx=1446\r\n" );
document.write( "      Σx2=130930\r\n" );
document.write( "      Sx=4.064070209\r\n" );
document.write( "      σx=3.93501906 \r\n" );
document.write( "      n=16      \r\n" );
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document.write( "That shows the data that's been calculated from L1 but you don't have to\r\n" );
document.write( "enter it, because it's automatically entered on the next screen.\r\n" );
document.write( "\r\n" );
document.write( "Press STAT again\r\n" );
document.write( "Press the right arrow key to highlight TESTS\r\n" );
document.write( "Press 7:ZInterval\r\n" );
document.write( "Make sure the screen reads like this, use the arrow key to highlight Data,\r\n" );
document.write( "not Stats.  Make sure the C-level reads 0.95\r\n" );
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document.write( "    Z-Interval\r\n" );
document.write( "Inpt:Data Stats\r\n" );
document.write( "σ:24.1\r\n" );
document.write( "List:L1\r\n" );
document.write( "Freq:1\r\n" );
document.write( "C-Level:0.95   \r\n" );
document.write( "Calculate\r\n" );
document.write( "\r\n" );
document.write( "Highlight Calculate with the down arrow key\r\n" );
document.write( "\r\n" );
document.write( "Press ENTER\r\n" );
document.write( "(78.566,102.18)\r\n" );
document.write( "x̄=90.375\r\n" );
document.write( "Sx=4.064070209\r\n" );
document.write( "n=16\r\n" );
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document.write( "The confidence interval is 78.566 < x < 102.18\r\n" );
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document.write( "So the expected upper end of it is 102.18.\r\n" );
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document.write( "Edwin
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