A Random Sample Is Selected from a Normally Distributed Population

Multiple Choice

A random sample is selected from a normally distributed population. The following sample statistics are obtained: n = 20, = 30, and s = 10. Based on this information, and using a 95% confidence level, which of the following statements is true?

A) The critical value is 1.7921.
B) The standard deviation of the sampling distribution ofis .50.
C) The margin of error is approximately4.68.
D) The critical value is 1.96.
E) The margin of error is approximately3.24.