document.write( "Question 1175460: In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $43.3 and standard deviation of $14.1. Construct a confidence interval at a 90% confidence level.\r
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Algebra.Com's Answer #801102 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

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document.write( "Hi\r\n" );
document.write( " n = 11 , x̄ = 14.1  and  s = 14.1  \"Sample sd\"\r\n" );
document.write( "90% confidence level  df = 10 , t = 1.81\r\n" );
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document.write( "ME = 1.81(14.1)/√11 = 7.695    |ME =\r\n" );
document.write( "CI = $44.3 ±  7.7\r\n" );
document.write( "Note:  Sample size small so CI bigger\r\n" );
document.write( "Wish You the Best in your Studies.\r\n" );
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