Samuel Tanner modified a comment on discussion Help

The 2-Population Means t-test or confidence interval with non-equal variances use the exact complicated formula for degrees of freedom, but round down the result to the closest integer, and then use that integer degrees of freedom to calculate the p-value or the confidence interval. That rounding down to integer degrees of freedom should be optional because some programs like Minitab operate the same, but some others like Statcrunch use the obtained fractional degrees of freedom for the t-distribution....

Samuel Tanner modified a comment on discussion Help

The 2-population mean t-test or confidence interval with non-equal variances use the exact complicated formula for degrees of freedom, but round down the result to the closest integer, and then use that to calculate the p-value or the confidence interval. That rounding down to integer should be an option because some programs like Minitab operate the same, but some others like Statcrunch use the fractional degrees of freedom for the t-distribution. Related to that is that the t-distribution calculator...

Samuel Tanner posted a comment on discussion Help

The 2-sample t-test or confidence interval use the exact formula for degrees of freedom, but round down the result to the closest integer and then use that to calculate the p-value or the confidence interval. That rounding down to integer should be an option because some programs like Minitab operate the same, but some others like Statcrunch use the fractional degrees of freedom. Related to that is that the t-distribution calculator accepts only integer degrees of freedom in Statcato. Programs like...

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