Answer:
a. I would ask every person in Ms. Tyson's third-period math class how many siblings they have. Then, I would add that those numbers together and divide by the number of people in Ms. Tyson's class to get the average.
b. It would result in a sample statistic because Ms. Tyson's third-period math class is a simply a sample of a population, not the entire population itself. The class is a fraction or percentage of a group as opposed to a whole group.
