Question: Exercise 3.9 Codebook Variable: blood_type Definition: What is your blood type (respond ? if you dont know)? Type: Categorical (1 = A, 2 = A+,

Exercise 3.9 Codebook Variable: blood_type Definition: What is your blood type (respond “?” if you don’t know)?

Type: Categorical (1 = A−, 2 = A+, 3 = B−, 4 = B+, 5 = AB−, 6 = AB+, 7 = O−, 8 = O+, 9 = Don’t know)

Variable: gender Definition: Gender Type: Categorical (1 = Female, 2 = Male)

Variable: prior_donor Definition: Have you ever donated blood before?

Type: Categorical (1 = Yes, 2 = No)

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