Hello there, can someone please help me with these questions? I never quite understood random samples and how to use them to solve questions😅 - like how do i generate random numbers on my calculator? *question b onwards 😊 (Image removed from quote.)
A random sample is just a way to
guess stuff about your population using a small, randomly selected subset. EG, guessing the average height of all 20 year old males by looking at the height of a few 20 year old males.
Take a random sample of \(n=5\) to be the top 5 people in that table. Persons 1-5. It could be any five people!
Of those 5, 2/5=40% drive a car, 2/5=40% catch a bus, and 1/5=20% walk. This is data from our
sample, and if we compare it to the total percentage for the population:
20% walk
40% drive
40% bus
It is actually identical - So in this case, our sample does a
fantastic job as an estimate, we got lucky! But different samples will be slightly less effective, purely based on chance