In june 2008, chemical analysis of n1 =110 water samples from various parts of catawba river were made. in june 2012, the experiment was repeated using n2 = 85 water samples. we have the following result: chlorine content (2008) chlorine content (2012)latex: \overline{x_1}x1x1¯ = 17.8 latex: \overline{x_2}x2x2¯ = 18.3s1 = 1.8 s2 = 1.21. an environmental agency claims that the mean chlorine content in river increased from 2008 to 2012. choose the appropriate hypotheses to test the claima) latex: h_o\: ; \: \mu_1-\mu_2=0\: \: vs\: h_a\: ; \: \mu_1-\: \mu_2\: > 0b) latex: h_o; \: \mu_1-\mu_2=0\: \: vs\: \: h_a; \: \mu_1-\mu_2< 0c) latex: h_o; \: \mu_1-\mu_2=0\: \: vs\: \: \: h_a; \: \mu_1-\mu_2\ne02. the standardized test statistic is about3. find the rejection region at latex: \alpha = 0.054. compute the observed significance of the test.