1- What level of measurement is the variable “annual income in dollars”?a) intervalb) ordinalc) ratio2- Suppose you have a dataset with n=292 hospitalized patients (each row is a patient, each column is a variable). One variable is the presence or absence of a staph nosocomial infection (0=none; 1=staph infection). What is the level of measurement for the staph infection variable)? Choose the best answera) ordinalb) nominalc) interval3- In Yang et al, (2012), the researchers considered a number of potential confounders. Which of the following did they confirm acted as a confounder? Choose the best answer.a) temperature at arrival in PACUb) amount of blood loss during the operational periodc) genderPlease select your best choice for each answer. What is your reasonning for choosing the answer.
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