<prompt> An investigator into the life expectancy of IV drug abusers divides sample of patients into HIV positive and HIV negative groups. What type of data does this division constitute -NominalOrdinalIntervalPoion  <response>: Scales can be: Qualitative: Categorical scales: Nominal : eg: names of countries . It;s like naming or labeling . Dichotomous : eg: yesno, presenceabsence. Ordinal : severity of disease: mildmoderatesevere.eg: staging of cancer, kuppusamy socioeconomic class. Quantitative: Metric scales: Interval Ratio Note: Dichotomous is a subtype of nominal with 2 categories . 