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The average sample number and conjunctive power for different values of δ A and δ B, l 1=0. The average sample number is the same for the simultaneous stopping design as for the improved stopping design (dashed lines). The maximum sample size N is chosen to achieve a disjunctive power of 90% under δ A=0.5,δ B=0. For the settings where δ A=0 and only one alternative hypothesis is true, no conjunctive power is shown.
