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

Question

Quizplus · Accepted Answer

The independent variables are 'running status' (experienced or novice) and 'carbohydrate solution concentration' (flavoured water, 3%, 6%, 9%).

Ten Experienced and Ten Novice Distance Runners (Running Status) Were