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But if I wanted to know how the

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whole population changed over
the course of that time how

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would you have to do it,
how would you do it? Pick a point.

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Pick a point? Not a point,
Sabrina? By picking different

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points. By picking different points?
Every single point.

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Every single point. If you wanna
know how the population

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changed over the course of that
six months you would

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technically at every single spot
cause ok you can look

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at one but that only tells how
much the population changed

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on that last day of that month or
on the first day of that

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next month however you wanna view it.
but if you stop at one

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on the dot then that can tell you
many people either came

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or left that community on that day,
but what about that day

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and all these other days? Gromeck?
So basically like uh

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basically from the start you add
them altogether five hundred

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and then back down though too. Yea.
So yea 1 plus 2 plus 3 all

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the way to five hundred and then all
the way back down and then

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so thats all the positive change
though but what are these

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going to do to my total? Well lets
pretend we added up all these

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positive values and got like, I don't know,
four thousand but what

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about that interval times and that
interval times, thats still in my

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frame of months. Casey? This is
going to make the altogether value

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less. Yes it will just make it smaller.
Do you think my overall

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change will be a positive change?
Yes. How come?

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There are more positive than negative.
You betcha because there are

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more positive than negative but you
have to include the negatives because

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it will bring down your overall total just a bit.