Find the critical value for the test of significance in each of the give information.
11. One-tailed test, \( \sigma^{2} \) is known, \( \alpha=0.05, n=34 \)
12. Two-tailed test, \( \sigma^{2} \) is known, \( \alpha=0.05, n=45 \)
13. One-tailed test, \( \sigma^{2} \) is unknown, \( \alpha=0.05, n=14 \)
14. Two-tailed test, \( \sigma^{2} \) is unknown, \( \alpha=0.05, n=10 \)
15. One-tailed test, \( \sigma^{2} \) is known, \( \alpha=0.01, n=40 \)
16. Two-tailed test, \( \sigma^{2} \) is known, \( \alpha=0.01, n=50 \)
17. One-tailed test, \( \sigma^{2} \) is unknown, \( \alpha=0.01, n=16 \)
18. Two-tailed test, \( \sigma^{2} \) is unknown, \( \alpha=0.01, n=9 \)
19. One-tailed test, \( \sigma^{2} \) is known, \( \alpha=0.01, n=38 \)
20. Two-tailed test, \( \sigma^{2} \) is unknown, \( \alpha=0.1, n=12 \)
