A 90% confidence interval for a population mean was constructed to estimate the mean number of milligrams needed of a certain drug to bring relief las reported by patients in a controlled setting supervised by a physician). The interval was calculated to be (400,800). Which one of the following interpretations is WRONG?
a. I am 90% confident that the sample mean is between 400m and 800m.
b. The margin of error indicates that the estimate of the population mean is within 200 m of the true population mean.
c. The sample mean is 600m.
d. I am 90% confident that the population mean is between 400m and 800m.