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Comments about CIs for difference between
two parameters
• When 0 is not in the CI, can conclude that one population
parameter is higher than the other.
(e.g., if all positive values when take Group 2 – Group 1, then
conclude parameter is higher for Group 2 than Group 1)
• When 0 is in the CI, it is plausible that the population
parameters are identical.
Example: Suppose 95% CI for difference in population
proportion between Group 2 and Group 1 is (-0.01, 0.03)
Then we can be 95% confident that the population proportion
was between about 0.01 smaller and 0.03 larger for Group
2 than for Group 1.
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