In a study on the effect of an oral rinse on plaque buildup on teeth, sixteen people whose teeth were thoroughly dleaned and polished were randomly assigned to two groups of eight subjects each. Both groups were assigned to use oral rinses (no brushing) for a 2-week period. Group 1 used a rin that contained an antiplaque agent. Group 2, the control group, received a similar rinse except that the rinse contained no antiplaque agent. A measure of plaque buildup was recorded at 14 days with means and standard deviations for the two groups shown in the table. Control Group Antiplaque Group Sample Size Mean 1.22 0.77 Standard Deviation 0.33 0.33 A USE SALT (a) State the null and alternative hypotheses that should be used to test the effectiveness of the antiplaque oral rinse. OH: (, - H) - 0 versus H: (, - Hg) < 0 O Hạ: (#, - H2) = 0 versus H,: (, - 2) - 0 O Ho: (H - H2) < 0 versus H,: (, - #2) > 0 O H,: (H, - H2) - 0 versus H,: (#, - #2) >0 O H: (u, - Hạ) - 0 versus H,: (, - H) 0 (b) Do the data provide sufficient evidence to indicate that the oral antiplaque rinse is effective? Test using a - 0.05. State the test statistic. (Round your answer to three decimal places.) State the rejection region. (If the test is one-tailed, enter NONE for the unused region. Round your answers to three decimal places.) State the condlusion. O H, is rejected. There is sufficient evidence to conclude that the oral antiplaque rise is effective. OH, is rejected. There is insufficient evidence to condlude that the oral antiplaque rise is effective. O H, is not rejected. There is insufficient evidence to condude that the oral antiplaque rise is effective. OH, is not rejected. There is sufficient evidence to condude that the oral antiplaque rise is effective. (c) Find the oproximate p-value for the test. O p-value < 0.005 O 0.005 < p-value < 0.010 O 0.010 < p-value < 0.025 O 0.025 0.100