I've recoded blood groups, but when comparing to retain or reject bill what test should I use?

Question 8 (3 marks) This question has two steps; Step 1: Recoding Recode Blood Groups (currently eight types) to create a new variable with two categories: Group 1. Rh Positives (Four Rh positive blood groups to be combined together) Group 2: Rh Negatives (Four Rh negative blood groups to be combined together) Step 2: Use your newly created recoded variable to test the hypothesis that there is no significant difference between Rh Positives and Rh Negatives in terms of knowing when to retain and when to reject null. Choose a suitable test to answer this question and provide a short description of results from your data analysis