In estimating the difference between two population means, if a 90% confidence interval estimate includes 0, then we can conclude that there is a 90% chance that the difference between the two population means is 0.

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If a 90% confidence interval estimate includes 0, it means that we cannot reject the null hypothesis of no difference between the two population means at the 10% level of significance. It does not indicate any probability that the difference is 0 or any other value.

In Estimating the Difference Between Two Population Means, If a 90