Funding for the VITAL/Ready to Teach collection was secured through the United States Department of Education under the Ready to Teach Program.
Investigations/Scott Foresman (2006)
Between Never and Always (complete)
Data: Kids, Cats, and Ads (complete)
Investigation 3, Sessions 1-4, pp. 44-67
Investigation 4, Sessions 1-3, pp. 68-81
Loading StandardsThis Cyberchase activity addresses a common misconception that a phenomenon whose probability is 50:50 should alternate outcomes during trials. It gradually presents the law of large numbers by beginning with 4 trials, 10 trials, and 350 trials, and showing that the results get closer and closer to 50%. The activity is motivated by a Cyberchase For Real episode on making a decision about what movie to attend.
1 hour
When Does 50-50 Become 50-50? QuickTime Video
Handout: Coin Flipping and More Flipping
Assessment: Level A
Assessment: Level B
Answer Key
1. Distribute the Handout: Coin Flipping and More Flipping .
2. Tell the students that they will watch a video of Bianca doing an experiment.
3. As they watch the video clip, ask the students to make a record of each experiment Bianca does and to complete the first part of the handout.
4. Show the When Does 50-50 Become 50-50? QuickTime Video .
5. Ask the students to complete parts 2 and 3 of handout.
6. Discuss with students the results of the handout.
Assessment: Level A (proficiency): Students are given the results of a survey of children's after-school activities, and are asked to predict from the survey how many of their classmates (out of 12) would be involved in a particular activity after school.
Assessment: Level B (above proficiency): Students are provided with results from 4 different experiments with different sample sizes, and are asked to determine which experiment's results are likely to be the most accurate.
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