Research question: Does carb loading the day before participating in a marathon impact your performance? Independent Var

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Research question: Does carb loading the day before
participating in a marathon impact your performance?
Independent Variable: Carb loading- the amount of carbohydrates
consumed within the defined timeframe
Dependent Variable: Marathon- performance in marathon measured
by the time to finish the race
Identify at least 1 issue discussed in the “Keys to
Effective Measurement” (observer/scorer bias, ceiling effect,
floor effect) that might impact the dependent variable. How might
that issue impact the variable and how could you attempt to solve
that problem?