3. By using the appendix tables, test the following hypotheses by estimating p-value. Use a = 0.05.| a) A random sample of 25 specimens showed a sample standard deviation, s, of 1.28. Ho:o² = 2 H1:0² # 2 b) n1 = 10, s? = 18, n2 = 9, s = 4.5. Ho: of = o? H1: of > ož %3D c) n1 = 9, sỉ = 12.16, n2 = 10, s = 5. Họ: of = o? H1: of < ož %3D

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