# I don't understand the formula for CI for the "difference"

How did you get the formula for it: since in the denominator of the fraction here deals with "two" sample sizes rather than "one" for "one population?" I appreciate it if you clarify

1 answers ( 0 marked as helpful)

Hello Seyed!

Thanks for reaching out!

If you are referring to the formula at 3.30 minute, it incorporates the sample size of population one and the sample size of population two.

By using this formula, we take into consideration both the spread of data within each group (standard deviations) and the potential difference between the means of the two groups. This allows us to construct a confidence interval that reflects the uncertainty associated with estimating the difference between the population means based on the samples.

Best,

The 365 Team