23. Confidence interval for M1 M2

In this video, we dive into constructing and interpreting confidence intervals for the difference between two population means (𝜇₁ − 𝜇₂). You’ll learn how to compare two groups using sample data and estimate the range in which the true difference lies. The lesson covers key cases, including when population variances are known and unknown, and explains when to use the z-distribution versus the t-distribution. Step-by-step examples will guide you through calculating the standard error, margin of error, and final interval. By the end, you’ll be able to confidently assess whether a significant difference exists between two means.