We wish to investigate if a new medicine is effective in reducing the length and severity of the flu. We take the next 20 patients who come to the walk-in clinic complaining of a flu and , after a medical exam to verify that the patients do have the flue, give them the new medicine and tell them about the new drug we are giving them. One week later, the patients are contacted and 15 patients state the new remedy was helpful in reducing the severity and length of the illness. Which of the following is not correct?
(a) This is a poor experiment because there is no control group. We do not know how many would feel better in a week without treatment.
(b) This is a poor experiment because it is not double-blind. The patients may feel relief because they thought the drug should work.
(c) This is a poor experiment because a convenience sample was selected. Patients who come to the walk-in clinic may have more sever flue than people who do not.
(d) This is a poor experiment because we didn't give the remedy to people without the flu to assess its effect in a control group.
(e) This is a poor experiment because the sample size is likely to be too small to detect anything but a large improvement when measuring the proportion of people reporting an improvement.