Question: 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

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.

Table 7.23:

Ending LDL Cholesterol Level Treatment Control Beginning s 3.4 3.4–4.1 4.1–4.9 > 4.9 3.4 3.4-4.1 4.1-4.9 > 4.9 18 21

Ending LDL Cholesterol Level Treatment Control Beginning s 3.4 3.44.1 4.14.9 > 4.9 3.4 3.4-4.1 4.1-4.9 > 4.9 18 21 17 11 4 25 35 S 3.4 3.4-4.1 13 28 15 16 4.1-4.9 > 4.9 30 14 36 14 22 12

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