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# Scale Factor

## Who should win extreme weight loss competitions?

Who should win extreme weight loss competitions? In the TV game show The Biggest Loser, contestants compete to lose the greatest percent of body weight. While some praised the show as a helpful source of inspiration, others criticized it as an unrealistic and unhealthy example of how to lose weight.

In this lesson, students use linear functions and lines-of-best-fit to predict results from Season 8 of The Biggest Loser and discuss whether such examples of extreme weight loss are realistic and sustainable.

### REAL WORLD TAKEAWAYS

• Losing no more than 2 pounds per week is considered healthy weight loss. The rapid, massive weight loss displayed on The Biggest Loser and other extreme weight loss shows is far out of line with this recommendation.

### MATH OBJECTIVES

• Create and interpret scatterplots
• Estimate a line of best fit and use it to make predictions
• Appreciate how the precision of a line-of-best fit changes as more data is added

Appropriate most times as students are developing conceptual understanding.