If we wish to use a regression line to determine the effect of multiple treatment levels (e.g., Treatment = 1, 2, 3), why can't we just plot the average outcome for each treatment level and "connect the dots?"
A. This will cause us to have too few equations to solve for our unknown parameters.
B. We cannot use a regression line to measure the effects of multiple treatments.
C. Connecting the dots generally will not form a line.
D. Using averages for each treatment level will generally create bias.
Answer: C
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