math · Grade 12 · Statistics
Conditional Probability Changes the Reference Group
Calculate probabilities from an invented two-way table.
Find this activity in the mathematics map
Explore the related learning targets, foundations and possible next connections.
Learning goals
- Calculate probabilities from an invented two-way table.
Before you begin
Understand the words and representations introduced in the Explore activity.
Age and grade do not measure readiness. Adjust reading or adult support to preserve the intended learning goal.
Follow the sequence
Complete practice
Practice previewConditional Probability Changes the Reference Group
Practice · Independent · 25 min
Calculate probabilities from an invented two-way table. A complete set with exploration, practice and application. Use the linked unit for the learning sequence and teaching guide.
1. Explore
Practice previewConditional Probability Changes the Reference Group: Explore and Explain
Explore · Independent · 10 min
Calculate probabilities from an invented two-way table. A focused learn activity. Use the linked unit for the learning sequence and teaching guide.
2. Practice
Practice previewConditional Probability Changes the Reference Group: Practice Independently
Practice · Independent · 10 min
Calculate probabilities from an invented two-way table. A focused practice activity. Use the linked unit for the learning sequence and teaching guide.
3. Apply
Practice previewConditional Probability Changes the Reference Group: Apply and Create
Apply · Independent · 15 min
Calculate probabilities from an invented two-way table. A focused apply activity. Use the linked unit for the learning sequence and teaching guide.
Download the unit pack
Numbered activities, separate answer keys and a teaching guide in one ZIP. The pack uses the focused sequence; the complete practice sheet above is an alternative.
Teaching and response guide
- Begin with: How many parts are flagged?
- Connect the response to: Among flagged parts, what fraction are defective?
- Ask students to apply the idea: Why are the last two fractions different?
Watch for: Accepting an answer without checking whether it uses the material and satisfies the requested relationship or criteria.
Check the answer criteria for each task. A supported explanation may have more than one acceptable response. These activities offer evidence to discuss; completing a sheet alone does not establish mastery.