An Article Describes a Study of the Effectiveness of a Fabric

Multiple Choice

An article describes a study of the effectiveness of a fabric device that acts like a support stocking for a weak or damaged heart. In the study, 94 people who consented to treatment were assigned at random to either a standard treatment (S) consisting of drugs or the experimental treatment (E) that consisted of drugs plus surgery to install the stocking. After two years, 36% of the 61 patients receiving the stocking had improved,while 23% of the patients receiving the standard treatment had improved. Which of the following hypotheses should be tested to determine whether the proportion of patients who improve is significantly higher for the experimental treatment than for the standard treatment? ​

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B)
C)
D)
E)