Researchers have claimed that the average number of headaches per student during a semester of Statistics is 19. Statistics students believe the average is higher. In a sample of n =  14 students the mean is 22 headaches with a deviation of 2. Which of the following represent the null and alternative hypotheses necessary to test the students' belief?     H0: μ = 19 vs. Ha: μ ≠ 19     H0: μ = 19 vs. Ha: μ < 19     H0: μ = 19 vs. Ha: μ > 19     H0: μ < 19 vs. Ha: μ = 19

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