Confidence interval and hypothesis testing.
Not what you're looking for?
Captopril is a drug designed to lower systolic blood pressure. When subjects were tested with this drug, their systolic blood pressure readings (in mm of mercury) were measured before and after the drug were taken, with the results given in the table:
a. Construct a 99% confidence interval for the mean difference between the before and after readings.
b. Is there sufficient evidence to support the claim that captopril is effective in lowering systolic blood pressure?
Subject A B C D E F G H I J K L
Before 200 174 198 170 179 182 193 209 185 155 169 210
After 191 170 177 167 159 151 176 183 159 145 146 177
Purchase this Solution
Solution Summary
The solution computes 99% confidence intervals for the mean difference. From this, a conclusion whether captopril is effective at lowering systolic blood pressure is shown.
Solution Preview
Solution:
Using the Statdisk software we get the results as :
n =12
Difference mean d =18.58333
Difference St Dev, sd =10.10363
Test statistic t = ...
Purchase this Solution
Free BrainMass Quizzes
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.
Know Your Statistical Concepts
Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.
Measures of Central Tendency
This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.