Multiple Choice
Ten experienced and ten novice distance runners (running status) were asked to run four marathons. During each run, a different carbohydrate solution (concentration) was consumed (flavoured water, placebo; 3% solution, low dose; 6% solution, medium dose; 9% solution, high dose) and race time was recorded. How many independent variables were measured?
A) 2
B) 3
C) 4
D) 5
Correct Answer:

Verified
Correct Answer:
Verified
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