Exam two in this course had an average of twenty with a standard deviation of two, in a sample size of twenty. Based on this which statement would be correct using a ninety-five percent confidence interval. A. She would accept her null hypothesis.
B. It is reasonable to assume that the population average on the exam could be 21.
C. The value of the statistic she should use for her 95% confidence interval is 2.093
D. She would use the "Z" distribution instead of the "T" because the population standard deviation is unknown.