13. Consider the following hypothesis test: H0: H=18； Ha:μ≠18. A sample of 36 provided a sample meanof 17 and a sample standard deviation of 3. Which of the following is/are correct?
(A) The computedtest statistic is -2；
(B) The degree of freedom is 17；
(C) The p-value ＜0.05；
(D) At a=0.05, the criticalvalues are±1.96 for the statistical testing；
(E) At o=0.05, do not reject the null hypothesis.