Consider the following statements concerning confidence intervals:
A. A confidence interval can only use information from the sample data to construct an interval estimate for a sample statistic not a population parameter.
B. An interval estimate is often preferred to a point estimate because an interval estimate provides more information.
C. To derive a confidence interval for a population mean when the population variance is unknown AND the sample size is small (<30), the population mean needs to satisfy that it is normally distributed.
only A is true
only B is true
only A and C are true
only B and C are true
A, B and C are true