ECI - Confidence Intervals for Two-Sample Means and Proportions Lesson

Sometimes a comparison is desired to see if one group is different from another group in some way. We need to have two samples, each with its own summary stats, and attempt a comparison through subtraction. Never being sure about those stats we are still required to construct a confidence interval around that difference. Using two samples will cause the basic procedures, conditions, and formulas for creating those intervals to adapt and reflect the input of two means or two proportions and two standard deviations.

Please visit the Stattrek tutorial on confidence intervals for difference between two means for a complete explanation of the formulas used. The question presented addresses how to determine which of two universities has the better standardized test scores. The formulas look a little "intimidating" so it is nice to know that the calculator can assist with the calculations.

Please visit the Stattrek tutorial on confidence intervals for difference between two means for a complete explanation of the formulas used by CLICKING HERE" Links to an external site.

IMAGES CREATED BY GAVS