How to find confidence intervals for a difference between unpaired means - AP Statistics
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Question
The 
confidence interval created for the difference in means between two training programs for middle distance college runners is 
. The variable being measured is the improvement in seconds of mile times over the course of a season. One program has more speed work and intervals, while the other focuses more on distance training.
What does the confidence interval tell us about the difference in the two programs?
The 
What does the confidence interval tell us about the difference in the two programs?
Answer
For there to be a statistically significant difference in the training programs, the 95% confidence interval cannot include zero. 
includes zero, so we can't say that one program is significantly better than the other.
For there to be a statistically significant difference in the training programs, the 95% confidence interval cannot include zero.
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