document.write( "Question 1042480: A random sample of health maintenance organizations (HMOs) was selected. For each HMO, the co-payment (in dollars) for a doctor's office visit was recorded. The results are as follows:
\n" ); document.write( "5, 6, 7, 11, 12, 7, 5, 10, 8
\n" ); document.write( "Under the assumption that co-payment amounts are normally distributed, find a 90% confidence interval for the mean co-payment amount in dollars. \r
\n" ); document.write( "\n" ); document.write( "what is the lower limit and upper limit?\r
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Algebra.Com's Answer #657454 by stanbon(75887)\"\" \"About 
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The results are as follows:
\n" ); document.write( "5, 6, 7, 11, 12, 7, 5, 10, 8
\n" ); document.write( "Under the assumption that co-payment amounts are normally distributed, find a 90% confidence interval for the mean co-payment amount in dollars.
\n" ); document.write( "what is the lower limit and upper limit?
\n" ); document.write( "x-bar = 7.89
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\n" ); document.write( "ME + 1.645*2.57/sqrt(9) = 1.409
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\n" ); document.write( "90% CI:: 7.89-1.409 < u < 7.89+1.409
\n" ); document.write( "lower limit:: 6.481
\n" ); document.write( "upper limit:: 9.299
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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