How can a strict subset of a probability space be collectively exhaustive?











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In the example given in this text, I am given 4 possible events in a space. Then I am told that two of the events are collectively exhaustive. How is this remotely possible?



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    Everyone is either healthy or diseased. What's the problem?
    – saulspatz
    Nov 23 at 17:03










  • The probability space defined in the question consists of 4 events: disease present, healthy, positive test, and negative test. The union of the events healthy and disease does not result in the probability space defined thus cannot be collectively exhaustive.
    – Kohler Fryer
    Nov 23 at 17:12















up vote
0
down vote

favorite












In the example given in this text, I am given 4 possible events in a space. Then I am told that two of the events are collectively exhaustive. How is this remotely possible?



enter image description here



Please help.










share|cite|improve this question


















  • 2




    Everyone is either healthy or diseased. What's the problem?
    – saulspatz
    Nov 23 at 17:03










  • The probability space defined in the question consists of 4 events: disease present, healthy, positive test, and negative test. The union of the events healthy and disease does not result in the probability space defined thus cannot be collectively exhaustive.
    – Kohler Fryer
    Nov 23 at 17:12













up vote
0
down vote

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up vote
0
down vote

favorite











In the example given in this text, I am given 4 possible events in a space. Then I am told that two of the events are collectively exhaustive. How is this remotely possible?



enter image description here



Please help.










share|cite|improve this question













In the example given in this text, I am given 4 possible events in a space. Then I am told that two of the events are collectively exhaustive. How is this remotely possible?



enter image description here



Please help.







probability probability-theory






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asked Nov 23 at 17:00









Kohler Fryer

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1031








  • 2




    Everyone is either healthy or diseased. What's the problem?
    – saulspatz
    Nov 23 at 17:03










  • The probability space defined in the question consists of 4 events: disease present, healthy, positive test, and negative test. The union of the events healthy and disease does not result in the probability space defined thus cannot be collectively exhaustive.
    – Kohler Fryer
    Nov 23 at 17:12














  • 2




    Everyone is either healthy or diseased. What's the problem?
    – saulspatz
    Nov 23 at 17:03










  • The probability space defined in the question consists of 4 events: disease present, healthy, positive test, and negative test. The union of the events healthy and disease does not result in the probability space defined thus cannot be collectively exhaustive.
    – Kohler Fryer
    Nov 23 at 17:12








2




2




Everyone is either healthy or diseased. What's the problem?
– saulspatz
Nov 23 at 17:03




Everyone is either healthy or diseased. What's the problem?
– saulspatz
Nov 23 at 17:03












The probability space defined in the question consists of 4 events: disease present, healthy, positive test, and negative test. The union of the events healthy and disease does not result in the probability space defined thus cannot be collectively exhaustive.
– Kohler Fryer
Nov 23 at 17:12




The probability space defined in the question consists of 4 events: disease present, healthy, positive test, and negative test. The union of the events healthy and disease does not result in the probability space defined thus cannot be collectively exhaustive.
– Kohler Fryer
Nov 23 at 17:12















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