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What is In the question, data has been divided into two groups, i.e. HIV positive/HIV negative Data should be measured on nominal scale especially Dichotomous type of nominal scale. and explain in detail?
Ans. is 'c' i.e., Categorical data Blood group is a qualitative (Categorical) data. Blood group are divided into qualitative categories (A, B, AB, 0) -3 Nominal Scale Data.