A pharmaceutical company claims that its new drug reduces systolic blood pressure. The systolic blood pressure (in millimeters of mercury) for nine patients before taking the new drug and 22 hours after taking the drug are shown in the table below. Using this data, find the 95%95% confidence interval for the true difference in blood pressure for each patient after taking the new drug. Assume that the blood pressures are normally distributed for the population of patients both before and after taking the new drug. Patient 1 2 3 4 5 6 7 8 9 Blood pressure (before) 188188 174174 173173 159159 168168 189189 169169 176176 182182 Blood pressure (after) 181181 150150 148148 151151 142142 170170 146146 163163 164164 Copy Data Step 3 of 4 :   Calculate the margin of error to be used in constructing the confidence interval. Round your answer to six decimal places.

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A pharmaceutical company claims that its new drug reduces systolic blood pressure. The systolic blood pressure (in millimeters of mercury) for nine patients before taking the new drug and 22 hours after taking the drug are shown in the table below. Using this data, find the 95%95% confidence interval for the true difference in blood pressure for each patient after taking the new drug. Assume that the blood pressures are normally distributed for the population of patients both before and after taking the new drug.

Patient 1 2 3 4 5 6 7 8 9
Blood pressure (before) 188188 174174 173173 159159 168168 189189 169169 176176 182182
Blood pressure (after) 181181 150150 148148 151151 142142 170170 146146 163163 164164

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Step 3 of 4 :  

Calculate the margin of error to be used in constructing the confidence interval. Round your answer to six decimal places.

 
 
 
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