At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga.
Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus.
Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
i think a
this one is a bit hard to explain, but I'll try my best.
a representative sample should have characteristics that reflect the ENTIRE population
if we only take people from ONE football game, our sample does not represent ALL football fans, for a number of reasons. For example, there are football fans all across the world, but since everyone in the sample comes from the same game, there might be a lot of characteristics of the sample population that aren't shared by the whole population
in order to make a representative sample, we would probably want to randomly select football fans from a LOT of different places
Hm, maybe I can explain with another example:
when we elect a president, we can't just pick voters from one state, that wouldn't be representative of everyone in the country.