A pharmaceutical company conducted a clinical trial to evaluate the effectiveness of a new medication. A random sample of patients showed an estimated mean reduction in symptoms of 7.2 points on a specific scale, with a margin of error of 0.8 points. Which of the following statements is NOT a valid conclusion from these data?
It is plausible that the true mean reduction in symptoms for all patients taking the medication is between 6.4 and 8.0 points.
The sample mean of 7.2 points is the best single estimate for the true mean reduction in symptoms for all patients.
It is highly probable that a randomly selected patient will experience a symptom reduction of exactly 7.2 points.
The interval from 6.4 to 8.0 points represents a range within which the population mean is likely to fall.
