Which of the following would be an example of the use of inferential statistics? You have your entire class's math grades, and you calculate the average math grade for your class. You have your entire class's math grades and you use the grades to find the average math grade for everyone in your school who's taken the same math course. You have your entire class's math grades, and you use these grades to estimate the average math grade for the same math course at another school.

We use inferential statistics to infer the population from the sample data. The entire math course is a sample, part of the population (the school). Therefore, using the grades to find the average math grade for everyone in your school who's taken the same math course is inferential statistics. The first choice is not inferential because you can find out the exact average in your class. Another school is out of the population, your school.