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We really can't do that.
Because any one you draw, I can cut in half, as well.
So remember although that theoretical practically it's not really so,
remember we talked about the blood pressure that if I had
an apparatus that was, could do infinitely fine measurements,
I could work out to a systolic blood pressure of 120.56789 or if I
practically speaking we can make those bars smaller and smaller and
eventually you're going to end up with a bar with a width of zero.
Then we can't work out data anymore.
So what do we do?
Fortunately mathematicians to the rescue and
as per usual if you see the graph there it's negative X minus H squared.
A nice little graph there.
A parabolic curve there and we can work out the area under the curve.
We needn't have a special shape like a square or rectangle.
The very smooth curve, we can work out the area under the curve for that.
Between two limits.
Integration is quite easy to do.
Now, the mathematics behind
statistics is going to draw this beautifully symmetrical normal curve.
I want to remind you when we roll the dice,
we said what was the probability of rolling an 11 or 12.
So we added those values, and
we're going to do exactly the same with a continuous variable.
We're not, we're never gonna ask what the probability of finding one value is.
We begin to colour in an area under the, the graph for
some distance from the spot out to one of the two sides.
And we are going to calculate that probability.
We're going to find our value somewhere in there and then say if it's more or
less than say, the point of five, that was our magical value.
Now we construct the graph, at least the mathematics or the program that
you use is going to construct that graph so that the whole area is still one.
It's going to be same as we had with the rolling of the die.
If you choose 0.05 now the graph that you see there is not really to scale
but it is going to decide where to make the cutoff so
that you see the darker area, the darker blue area, where that would represent
five percent or 0.05 of the total area under that curve.
The value that is found by doing research is then going to fall
either within those limits and we can work out the p value.
The probability for that area under the curve.
But we would say it is less than 0.05 having found that result with that
research with the probability of less than 0.05.
So it's going to convert all the differences in means, the means of a group.
It's going to convert that to some value on the x-axis, and
its gonna fall either within that 0.05, or it's going to fall outside of it and
we can actually work out that area under the curve.
Now, you've seen me draw little curves and everything was on the one side,
but most of the time that's not how we're going to do it.
We can do this.
We're going to split the 5%, 0.05 up into 0.025.
2.5% on either side and our values are going to fall on either side of that.
We're still going to calculate an area under the curve.
So that's how it works. It's an area under the curve,
it falls between different limits and
the results that are found either falls within those areas or
it falls outside of the p value of less than 0.05 or a p value of more than 0.05.