List all 10 possible SRSs of size n = 2, calculate the proportion of females for each sample

we have a total of 10 choices,

while we need SRS of size 2 only,

We know that,

A combination helps us to determine the number of possible arrangements that can be made through a set of data provided where the order of the selection does not matter.

where,

n is the number of choices,

r is the number of selection.

All 10 possible SRSs of size n = 2, are:

1.  Abigail & Bobby

2. Abigail & Carlos

3.  Abigail & DeAnna

4.  Abigail & Emily

5.  Bobby & Carlos

6.  Bobby & DeAnna

7.  Bobby & Emily

8.  Carlos & DeAnna

9.  Carlos & Emily

10.  DeAnna & Emily

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Step-by-step explanation:

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step-by-step explanation:

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is symmetric about the line y = 120,000.

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