A new fitness tracker claims to accurately measure calorie expenditure during exercise. However, a review of several independent studies found that the tracker consistently overestimated calorie burn by an average of 20%. The manufacturer argues that this overestimation is negligible, as users are primarily interested in tracking progress over time, not absolute accuracy. Which of the following, if true, most seriously undermines the manufacturer's argument?
- AThe 20% overestimation varies slightly depending on the type and intensity of exercise performed.
- BThe tracker also provides accurate heart rate and step count data, which are important for overall fitness tracking.
- CCompetitor fitness trackers have similar or even greater inaccuracies in calorie expenditure measurement.
- DMany users rely on the tracker's calorie burn data to set precise dietary goals for weight loss.
Show answer & explanationAnswer & explanation
Correct answer: D. Many users rely on the tracker's calorie burn data to set precise dietary goals for weight loss.
The manufacturer argues that the 20% overestimation is negligible because users care about *relative* progress, not *absolute* accuracy. To undermine this, one must show that absolute accuracy *is* important to users for their primary goals. If users rely on the data for precise dietary goals for weight loss, then a consistent 20% overestimation is far from negligible; it would actively mislead them and hinder their progress, making absolute accuracy crucial.
Why the other options are wrong
- A. This explains *how* the overestimation varies, but doesn't undermine the manufacturer's claim that the *overall* overestimation is negligible for user purposes.
- B. This highlights other accurate features, but doesn't address the specific argument about the negligibility of calorie burn inaccuracy.
- C. The inaccuracy of competitors doesn't make the manufacturer's inaccuracy negligible; it just means others might also be flawed.
Challenging 'Negligible' Claims
To challenge a claim that an inaccuracy or flaw is 'negligible,' one must demonstrate that the supposed negligible factor has a significant practical impact on the intended use, outcome, or user experience, thereby proving its importance.
- Demonstrate practical significance.
- Connect inaccuracy to user goals.
- Show negative impact on desired outcomes.
Memory trick: Negligible claims crumble when practical impact is shown to be significant.