WEBVTT

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<v Instructor>Hello, students.</v>

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We are now going to start chapter five

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and we are gonna start with problem two.

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So first, again, I'm going to read the problem.

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Problem two states, hyperlipidemia in children

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has been hypothesized to be related

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to high cholesterol in their parents.

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The following data were collected on parents and children.

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So here, we have basically the information

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about both the parents or one parent in the columns

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and the children information as the rows.

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So whenever I see a table like this,

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the first thing I do is add the rows and the columns,

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and that really, really is very helpful,

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and that's what I have basically done here.

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So what is the first problem asking us, which is A?

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It is asking us what is the probability

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that one or both parents are hyperlipidemic?

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So...

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We have to look at here the numerator.

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So the numerator here is asking us

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about one or both of the parents' hyperlipidemia status,

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so we are going to add them, so both or one parent,

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and we are adding their hyperlipidemia status.

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And that will be equal to

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58 plus 76.

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Which is 134.

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So again, where did I get those two numbers from,

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I want to use another color so you can see it nicely.

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So this is where I'm getting the 58 and 76,

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because we are talking about both parents

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being hyperlipidemic or one parent being hyperlipidemic.

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Now, for the denominator, there are no conditions

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or stipulations attached.

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So that will be our entire cohort, our entire population.

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And what is that? That is 223.

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So our entire cohort, and again,

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I'm going to use a different color this time again.

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And that is this, 223.

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That is going to be our denominator.

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So now to do the calculation, what we have to do, again,

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I'm gonna go back to black, the color I was using.

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For the calculation, what we have to do is take 134

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and divide that by 223.

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And what do we get as a result?

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We are going to get 0.60 or 60%, so what does this mean?

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This means that the probability of one

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or both parents being hyperlipidemic is 60%

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if the child or the children is hyperlipidemic, okay.

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So 60% is the probability, so the probability,

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and I'll write it here.

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So the probability

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of one

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or both

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parent being hyperlipidemic

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60% if the child is hyperlipidemic

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based on the values provided on this table.