00:01
So you have the following information that 10 % of people have depression, 10 % have depression, and that for those people that have depression, that there is a 22 % chance of getting dementia versus not depressed, that that is a 17 % chance of getting dementia.
00:38
And then you didn't ask a question.
00:41
So what i'm going to do is i'm just going to draw a tree diagram.
00:43
I suspect that you have a whole bunch of questions that might deal with dementia.
00:50
And so here is someone that has depression.
00:54
I'll call it dp.
00:56
And this is not dp.
01:01
And we know that that is 10%.
01:03
So this is 90%.
01:04
And then off of this branch, these are actually all conditional probabilities.
01:10
This is the probability of having dementia.
01:15
I'll just leave it as i'll call it dm.
01:18
And this is not dementia.
01:22
And we know that 22 % chance here versus 78 % chance here.
01:28
And then for those who are not depressed, we have dementia happening in 17 % of cases.
01:34
So in 83 % not.
01:36
And then this is not dementia.
01:38
So this, as i said, really is, and let me do a little erasing here and move this up so that i can put a couple pieces of information here.
01:49
So this is not depressed.
01:58
So this, as i said, is a conditional probability...