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It may be a statistical problem in high school mathematics.
For independence test, you can make a contingency table first.

Sum of group a and group b

Healing 24 6 30

Incomplete 6 24 30

Sum 30 30 60

Then use the independence test formula.

Chi-square =60×(24×24-6×6)? /(30×30×30×30)=2 1.6> 10.828

It shows that more than 99.9% are sure that drug treatment is effective.

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