Suppose the mass of college students can be modeled by the normal distribution. We believe the mean

of the normal distribution is 72 kg. We randomly sample 18 students and find an average of 69 kg and a
standard deviation of 4kg.
A. The standard error of óx is 0.9428
B. A t-statistic can be calculated and it is equal to −3.18
C. The degrees of freedom for the t-distribution will be 17
The correct statement(s) is(are)
(1) Only A
(2) All three statements are correct.
(3) B and C
(4) A and B
(5) A and C