Simple random sampling uses a sample of size n from a population of size n to obtain data that can be used to make inferences about the characteristics of a population. suppose that, from a population of 80 bank accounts, we want to take a random sample of four accounts in order to learn about the population. how many different random samples of four accounts are possible?

1,581,580

Explanation:

Here we have a combination problem, because the order of the selected accounts is not important. (if the order was important, it would be a permutations problem)

We have 80 possible accounts (n)

Out of which we need to select 4 (r)

C(n,r) = n! / (r! (n - r)!)

C(80,4) = 80! / (4! 76!) = 1,581,580

So, there are 1,581,580 different random samples of 4 accounts out of 80.

15 pounds of apples and 6 cups of flour

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