Question: A heart failure study is being conducted on a new drug (Drug X) vs placebo to determine whether or not there is morbidity or mortality

A heart failure study is being conducted on a new drug (Drug X) vs placebo to determine whether or not there is morbidity or mortality benefit.Researchers are concerned that the baseline demographics may confound the results, and seek to stratify patients based on heart failure severity.Patients are categorized into New York Heart Association (NYHA) Class I, NYHA Class II, NYHA Class III, and NYHA Class 4 (least severe to most severe).To compare the results between the Drug X group and the placebo group, the researchers plan to utilize Mann-Whitney U.

How would you best describe the data being analyzed __? What is the null hypothesis for this specific test and survey __?

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