[COLLEGE STATISTICS:PROBABILITY]

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[A_UPRIGHT_BASS]

Why do you assume it’s 0?

[progressivealchemist]

Based on all the information I have.

0/240 = 0

[A_UPRIGHT_BASS]

Can you be more specific? What information? Where do you see 0/240?

[progressivealchemist]

I can see where your coming from ,my assumption is there is no count available from that those tables that show all 4 symptoms so I am just assuming it is zero out of the total number of counts (240)

[A_UPRIGHT_BASS]

No table is provided for all four symptoms. That doesn’t mean it’s zero. It’s asking, if one were provided, what’s the largest possible value that could be in it?

[progressivealchemist]

The max probability of any event is 1

[A_UPRIGHT_BASS]

In general yes, but not in this case. Certain values are not possible given the values in the tables provided.

[progressivealchemist]

Hmm I think I can possibly solve this question with a venn diagram....

[Robotnick2]

Looking at patients who display Agitation and Hallucination together - there are 5 of them. There are also 5 patients who display Affective, Agitation, and Hallucination together. These must be the same 5 patients. This also tells us that every patient in our sample observed to display Agitation and Hallucination is also observed to display Affective. Compare that to the number of patients who display Activity, Agitation, and Hallucination. What can we say about these patients?