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Stats

Stats. Section 3.5 Notes. Multiplication Rule: Complements and Conditional Probability.

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Stats

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  1. Stats Section 3.5 Notes

  2. Multiplication Rule:Complements and Conditional Probability • Consider the family with three children. As discussed earlier in class, the sample space consists of eight, equally likely, outcomes. The sample space is {b-b-b, b-b-g, b-g-b, b-g-g, g-b-b, g-b-g,g-g-b, g-g-g}. • Find the probability of a couple having at least one boy. Assume that boys and girls are equally likely and that the sex of one child is independent of the sex of subsequent children.

  3. Assuming that event A is the event that at least one of the three children is a boy. Also assume that the complement of event A, is the event that all three children are girls. To find the probability of at least one of something, calculate the probability of none, then subtract that result from 1.

  4. Recall?

  5. Conditional Probability • The conditional probability of an event is the probability obtained with the additional information that some other event has already occurred. denotes the conditional probability of event B occurring, given that event A has already occurred, and it can be found by dividing the probability of events A and B both occurring by the probability of event A:

  6. Example • Consider the following data regarding the sinking of the Titanic.

  7. If we randomly selected someone who was aboard the Titanic, what is the probability of getting a boy, given that the selected person survived? • If we randomly selected someone who was aboard the Titanic, what is the probability of getting a survivor, given that the selected person is a woman? • Teachers note: Do some more on board if needed.

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