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A pharmaceutical company has developed a new drug which they believe will reduce cholesterol levels. 21 patients were randomly assigned to the treatment group (receive new drug). Another 23 patients were assigned to the control group (received existing drug). The "before" cholesterol value for each patient was recorded, then the "after" cholesterol value, and finally the total cholesterol reduction for each patient was recorded. Here is the data: in x(bar) Treatment group (new drug) 21 22.45 7.99 Control group (old drug) 23 18.52 7.15 Calculate a 90% confidence interval for the difference in reduction of cholesterol between these two drugs. Use Option 1 (technology) for degrees of freedom and round to three decimal places. The lower bound of confidence interval is:

A pharmaceutical company has developed a new drug which they believe will reduce cholesterol levels. 21 patients were randomly assigned to the treatment group (receive new drug). Another 23 patients were assigned to the control group (received existing drug). The "before" cholesterol value for each patient was recorded, then the "after" cholesterol value, and finally the total cholesterol reduction for each patient was recorded. Here is the data: in x(bar) Treatment group (new drug) 21 22.45 7.99 Control group (old drug) 23 18.52 7.15 Calculate a 90% confidence interval for the difference in reduction of cholesterol between these two drugs. Use Option 1 (technology) for degrees of freedom and round to three decimal places. The lower bound of confidence interval is:

Algebra: Structure And Method, Book 1
Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter12: Quadratic Functions
Section12.8: Joint And Combined Variation
Problem 11P
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A pharmaceutical company has developed a new drug which they believe will reduce cholesterol levels. 21 patients were randomly assigned to the treatment group (receive new drug). Another 23 patients were assigned to the control group (received existing drug). The "before" cholesterol value for each patient was recorded, then the "after" cholesterol value, and finally the total cholesterol reduction for each patient was recorded. Here is the data: x(bar) Treatment group (new drug) 21 22.45 7.99 Control group (old drug) 23 18.52 7.15 Calculate a 90% confidence interval for the difference in reduction of cholesterol between these two drugs. Use Option 1 (technology) for degrees of freedom and round to three decimal places. The lower bound of confidence interval is:
Transcribed Image Text:A pharmaceutical company has developed a new drug which they believe will reduce cholesterol levels. 21 patients were randomly assigned to the treatment group (receive new drug). Another 23 patients were assigned to the control group (received existing drug). The "before" cholesterol value for each patient was recorded, then the "after" cholesterol value, and finally the total cholesterol reduction for each patient was recorded. Here is the data: x(bar) Treatment group (new drug) 21 22.45 7.99 Control group (old drug) 23 18.52 7.15 Calculate a 90% confidence interval for the difference in reduction of cholesterol between these two drugs. Use Option 1 (technology) for degrees of freedom and round to three decimal places. The lower bound of confidence interval is:
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