In order to verify the efficacy of a new drug for the treatment of hypertension, clinicians gave the drug to 100 hypertensive patients. 65 people's blood pressure did indeed drop. Therefore, the pharmaceutical factory claimed that the drug was indeed effective.
The statement 'A patient with high blood pressure is given a tablet that has the same appearance as the drug but does not contain the drug effect, and the patient's blood pressure does not drop' can weaken the above conclusion the most.