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A study was conducted on the effect of an oral antiplaque rinse on plaque buildup on teeth. Sixteen people whose teeth were thoroughly cleaned and polished were randomly assigned to two groups of eight subjects each. Both groups were assigned to use oral rinses (no brushing) for a two-week period. Group 1, the control group, received a rinse that, unknown to the subjects, contained no antiplaque agent. Group 2 used a rinse that contained an antiplaque agent. A plaque index x, a measure of plaque buildup, was recorded at 4, 7, and 14 days. The mean and standard deviation for the 14-day plaque measurements are shown in the table for the two groups. Control Group Antiplaque Group Sample size 8 8 Mean 1.26 0.76 Standard deviation 0.36 0.36 (a) State the null and alternative hypotheses that should be used to test the effectiveness of the antiplaque oral rinse. O Ho: (H1 - H2) = 0 versus Ha: (#1 - /2) # 0 O Ho: (H1 - M2) = 0 versus Ha: (#1 - M2) > 0 O Ho: (41 - 12) = 0 versus Ha: (#1 - H2) 0 (b) Do the data provide sufficient evidence to indicate that the oral antiplaque rinse is effective? Test using a = 0.05. (Round your answers to three decimal places.) Test statistic: t = Rejection region: If the test is one-tailed, enter NONE for the unused region. Conclusion: O Ho is rejected. There is sufficient evidence to indicate that the oral antiplaque rise is effective. O Ho is rejected. There is insufficient evidence to indicate that the oral antiplaque rise is effective. O Ho is not rejected. There is sufficient evidence to indicate that the oral antiplaque rise is effective. O Ho is not rejected. There is insufficient evidence to indicate that the oral antiplaque rise is effective. (c) Find the approximate p-value for the test. O p-value 0.100