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Table 7.23 refers to a study that randomly assigned subjects to a control or treatment group. Daily during the study, treatment subjects ate cereal...

Table 7.23 refers to a study that randomly assigned subjects to a control or treatment group. Daily during the study, treatment subjects
ate cereal containing psyllium. The study analyzed the effect on LDL cholesterol.
a. Model the ending cholesterol level as a function of treatment, using the beginning level as a covariate. Interpret the treatment effect.
b. Repeat part (a), now treating the beginning level as qualitative. Compare results.
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