H0: The new drug is as effective as the standard drug.
  H1: The new drug is more effective than the standard drug.
A study is conducted in which the investigator administers the new drug and the standard drug to different patients suffering from a particular disease. The proportion of cures for both drugs is noted. What types of errors can you make in deciding between the two hypothesis?
Think about these questions:
1. Which error might be considered more serious from an ethical point of view?
2. To know the true proportion of patients suffering from the disease who would be cured by the new drug, we would have to admister the drug to all patients. Is this possible?