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1. What is the null hypothesis? Use a = 0.05 .
A) H0:μ1 ³ μ 2
B) H0:μ1 = μ 2
C) H0:μ1 £ μ 2
D) H0:μ1 ¹ μ 2
2. Calculate the critical value. Use a = 0.05 .
A) -2.33
B) -2.58
C) -1.96
D) -1.645
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