If the 95% confidence interval for the difference between the means includes the value zero, then we are likely to get a P-value less than 0.05 when we do a two-sample t-test.

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If the 95% confidence interval for the difference between the means includes zero, it suggests that there is no significant difference between the groups, leading to a P-value greater than 0.05, not less.

If the 95% Confidence Interval for the Difference Between the Means