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Statistics: Conditional Probability
by Texas Instruments

#### Objectives

• Students will identify the difference between the probability of an outcome and the conditional probability of an outcome.
• Students will answer probability questions using information presented in a table and in a graph.

#### Vocabulary

• conditional probability
• probability
• two-way table

#### About the Lesson

This lesson involves thinking about probability when additional information is given.
As a result, students will:

• Investigate probability questions using tabular and graphical information.
• Explain why a two-way table with two rows and two columns with fixed row and column totals needs only one input to determine the others.
• Answer questions about the probability of an outcome using data from a two-way table.
• Use bar graphs separated according to categories to answer probabilities and connect these graphs to information of the form P(A|B).
• Choose between information presented as the probability of A given B and the probability of B given A (A|B and B|A) to answer specific probability questions.