We are interested in a study comparing differences in mean reduction in blood pressure across four treatments: placebo, community health worker, new drug, and a combined therapy of community health worker + new drug combo. We fit a model to predict reduction in blood pressure using treatment. Which of the following is NOT an assumption for this model?
i.) The association between treatment and reduction in blood pressure must be linear.
ii.) The observations must be independent.
iii.) The variance of the residuals must be constant across treatment groups.
iv.) The residuals must be normally distributed.
Please respond only if you are 100% confident about the answer and provide a reasoning why you think that's the answer. Thank you.
We are interested in a study comparing differences in mean reduction in blood pressure across four treatments: placebo, community health worker, new drug, and a combined therapy of community health wo...
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