Test the null hypothesis that the treatments are equally effectual?

The cure rate for the current treatment is approx. 60%. We anticipate that the new treatment will prove more effective in curing bug. It would only be recommended if it increased the cure rate by 20%. So the effect size is 60% vs. 80%.
Answers:
If the new treatment increased the cure rate by 20%, the "new" cure rate would be 72%. The current "cure rate" is 60%. Increasing this "cure rate" by 20% = (.20)(60%) +60% = 72%.

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