3. A drug company states that the headache medicine it manufactures can cure headaches in 15 minutes. The Consumers Foundation wants to conduct a test whether the statement is acceptable or not. Then, a random sample was taken from 25 consumers with headache, and after the drug was used and the duration of recovery has recorded an average of 18 minutes was obtained with a standard deviation of 4 minutes. 

Based on this information, what conclusions can be drawn if they have a 95% confidence level? 

(answering tips: it's a good medicine if it can heal faster it's the basis for making hypotheses)