9.4.1 WP Consider the test of Ho: 0² = 7 against H₁: σ² ± 7. What are the critical values for the test statistic X (6) for the follow- ing significance levels and sample sizes? a. α= 0.01 and n = 20 b. α = 0.05 and n = 12 C. α= 0.10 and n = 15