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What is the main difference between one population and two populations hypothesis testing?

What is the main difference between one population and two populations hypothesis testing?

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WE can use a hypothesis test to examine or challenge a statistical claim about a population mean if the variable is numerical (for example, age, income, time, and so on) and only one population or group (such as all U.S. households or all college students) is being studied. For example, a child psychologist says that the average time that working mothers spend talking to their children is 11 minutes per day, on average.

In other words , in single population hypothesis testing , w check for the statement whether the mean of the population is equal to some hypothetical constant value or not .

The hypotheses for a difference in two population means are similar to those for a difference in two population proportions. The null hypothesis, H0, is again a statement of “no effect” or “no difference.” The alternative hypothesis,

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