10. A Confidence Interval for the Difference of Two Independent Means

Not much changes here, except for the inclusion of the point estimate for the difference in population means μ1μ2, which is the value 12, and the standard deviation of the sample difference, which as discussed earlier is


A level C = (1 – α) ⋅ 100% confidence interval for the population mean difference is, therefore:


which, in interval notation, is: