Which of the Following Statements Is True When Small Samples

Multiple Choice

Which of the following statements is true when small samples are used to estimate the true population mean where the population standard deviation is unknown?

A) The standard normal distribution must be used to obtain the critical value.
B) The t distribution must be used to obtain the critical value.
C) The margin of error for the confidence interval estimate tend to be very small.
D) All of these.
E) None of these.