Fuzzy Approach for Group Sequential Test

Figure 2

Decision criteria for testing 𝐻₀∶𝜇=𝜇₀ versus 𝐻₁∶𝜇≠𝜇₀ using 𝛼-cuts.

(a) Reject 𝐻₀ if 𝑍>CV₂

(b) Reject 𝐻₀ if 𝑍<CV₁

(c) Accept 𝐻₀ if CV₁<𝑍<CV₂

(d) No decision if CV₁≈𝑍<CV₂

(e) No decision if CV₁<𝑍≈CV₂