Rory is researching how much variance in an individual's heart rate changes when giving an impromptu speech as predicted by an individual's level of communication apprehension. Rory gets a coefficient of determination R2. of .821. What does this mean?
A) 9% of the variance in an individual's heart rate changes when giving an impromptu speech as predicted by an individual's level of communication apprehension
B) 17.9% of the variance in an individual's heart rate changes when giving an impromptu speech as predicted by an individual's level of communication apprehension
C) 82% of the variance in an individual's heart rate changes when giving an impromptu speech as predicted by an individual's level of communication apprehension
D) 80% of the variance in an individual's heart rate changes when giving an impromptu speech as predicted by an individual's level of communication apprehension
Correct Answer:
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