A researcher calculates a 90% confidence interval for the population mean as [45,55]. Which interpretation is correct?
a) 90% of sample means will fall between 45 and 55.
b) We are 90% confident the interval [45,55] contains the population mean.
c) There is a 90% probability the population mean is between 45 and 55.
d) 90% of the population data lies between 45 and 55.