SENIC (Study on the Efficacy of Nosocomial Infection Control) Has

Multiple Choice

SENIC (Study on the Efficacy of Nosocomial Infection Control) has a public data set from 1975 to 1976 that contains information on 113 hospitals, including rankings according to cleanliness and the probability of acquiring an infection in the hospital.If a researcher wants to look for a relationship between these variables, what test should be used and why?

A) paired-samples t test, because two means are being compared
B) z test, because the underlying parameters of the population are known
C) Pearson correlation, because scale variables are used for both the ranking of cleanliness variable and the risk probability variable
D) Spearman correlation, because the cleanliness variable is ordinal and the risk probability can be converted into an ordinal variable