Chi-square Test; Fisher’s Exact Test   CHI & FISHER

Exercise:
  Two disease prevention protocols (A, B) for a certain disease were evaluated (infection vs. no-infection). The protocol A (18 cases) showed 14 infection and 4 non-infection cases, whereas the protocol B (22 cases) showed 8 infection and 14 non-infection cases.

  Analyze whether there is a statistical difference between protocols A and B in disease prevention.

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