document.write( "Question 1182976: The effectiveness of a blood-pressure drug is being investigated.
\n" ); document.write( "An experimenter finds that, on average, the reduction in systolic blood pressure is 55.8 for a sample of size 29 and a standard deviation 7.9.
\n" ); document.write( "Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 90% confidence level).
\n" ); document.write( "Assume the data is from a normally distributed population.\r
\n" ); document.write( "\n" ); document.write( "Answer as a tri-linear inequality accurate to 3 decimal places.
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Algebra.Com's Answer #813364 by robertb(5830) $\"\"$ $\"About$

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The confidence interval will be given by \r
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\n" ); document.write( "\n" ); document.write( " $\"53.3+%3C=+X-bar+%3C=+58.3\"$ , with the endpoints rounded to 1 d.p.\r
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\n" ); document.write( "\n" ); document.write( "Note that we used the t-distribution with degree of freedom 29 - 1 = 28, using a 90% confidence level. \r
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