An investigator into the life expectancy of IV drug abusers divides a sample of patients into HIV positive and HIV negative groups. What type of data does this division constitute?: (A) Nominal, (B) Ordinal, (C) Interval, (D) Portion
Answer is A. In the question, data has been divided into two groups, i.e. HIV positive/HIV negative → Data should be measured on the nominal scale especially Dichotomous type of nominal scale.