18) Researchers have claimed that the average number of headaches per student during a semester of

Statistics is 16. Statistics students believe the average is higher. In a sample of n = 19 students the

mean is 20 headaches with a deviation of 1.9. Which of the following represent the null and

alternative hypotheses necessary to test the students' belief? Choose below and explain why

A) H0: = 16 vs. Ha: < 16

B) H0: = 16 vs. Ha: > 16

C) H0: < 16 vs. Ha: = 16

D) H0: = 16 vs. Ha: 16