You are here (click or tap to change)    Back to Chapter 9 Main Page

CI for Matched Pairs

 

9.8 Confidence Interval to Compare Two Population Means: Matched-Pair Experiments

Graphing Calculator Example
Now You Try It!

A strength training program is designed to improve core strength.  To test its effectiveness, 12 patients are timed in seconds while holding a position called the plank before and after a 3 week strength program.  Use the data below to construct a 95% confidence interval for the true  μd between pre-core strength and post-core strength.  Is zero in the interval?  If so, what does this tell us?    

Pre-Program   38 47 63   50 41 30 35 34  44    43    46  52
Post-program 67 92 120 75 69 60 68 65 131 122 120 135
 

 

  Back to Chapter 9