Conditional Probability Two-Way Frequency Tables Scavenger Hunt Activity During this activity, students travel around the room answering conditional probability questions involving two-way frequency tables. This activity is a great opportunity to group students or let students work with a partnerTwo-Way Tables and Probability When finding probabilities involving two events, a two-way table can display the sample space in a way that makes probability calculations easier. Consider the example on page 303. Suppose we choose a student at random. Find the probability that the student s (a) has pierced ears. (b) is a male with pierced ears.

Fill in the gaps Design your own two way table Medical diagnosis A patient has a test to see if they have or do not have a particular disease The test gives a result – either positive or negative Two Way Table for testing Definitions False Positive A healthy person is told they have the disease False Negative A person with the disease is told they don’t have it Further definitions Sensitivity Probability that a person who has the disease gets a positive result Closer it is to 1 the ...

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