Question

Life situation where could be used statistical inference (confidence interval or hypothesis test) on two samples? how would you do it?

Answer 1

Suppose we have two different groups to compare the same attribute, in these cases we use statistical inference (confidence interval or hypothesis test) on two samples

For example, the daily calorie consumption of males and females in a particular state

If the variance is known we will use statistical inference (confidence interval or hypothesis test) on two samples using z values and if the variance is unknown we will use statistical inference (confidence interval or hypothesis test) on two samples using t values.

The procedure is to assume initially that the means are the same and then check for the significance for the difference if it is truly 0 or not.