 # Calculate Conditional Probabilities Using a Two-Way Table

##### This Calculate Conditional Probabilities Using a Two-Way Table lesson plan also includes:

Multiple worked examples and clear explanation of arithmetic steps really make this presentation on conditional probability stand out.  Specifically, an emphasis on the reasoning behind the calculations helps young statisticians develop their probability intuition. Great as a conditional probability refresher or as an introduction to the two-way table. This presentation provides a key addition to your existing probability unit or lesson plans.

CCSS: Designed

##### Instructional Ideas

• Link presentation to class website for pre-class viewing in a flipped classroom model or for homework help in a traditional setting
• Divide the class into small groups, with each tasked to research their own data set to turn into a two-way table and analyze
• The class can devise a survey for their classmates to determine conditional probabilities of an attribute like hair or eye color, as shown in the lesson
##### Classroom Considerations

• Lesson viewing requires Internet access and teacher creation of a free LearnZillion account
• Printable lesson slides are available under the Additional materials tab in the lesson
• Consider prepping remediation ahead of time for weaknesses in simple probability calculation that become apparent in this lesson
##### Pros

• Pleasant and easily understood narration
• Logical progression of examples, from simple to complex
• Each problem is worked completely, no skipping of arithmetic steps
• Clear explanation of simplification shortcuts
##### Cons

• No guided practice / homework problems provided