5. Which of the following describes a null hypothesis using two-tailed test? A. H_0:mu =mu _0 B. H_0:mu neq mu _0 C. H_0:mu β₯ q mu _0 D. H_0:mu β€ mu _0 6. Which of the following describes an alternative hypothesis using two- tailed test? A. H_a:mu <50 years old C. H_a:mu neq 50 years old B. H_a:mu >50 years old D. H_a:mu =50 years old