In a study on the effect of an oral rinse on plaque buildup on teeth,sixteenpeople whose teeth were thoroughly cleaned and polished were randomly assigned to two groups ofeightsubjects each. Both groups were assigned to use oral rinses (no brushing) for a2-weekperiod.Group 1used a rinse 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 at14 dayswith means and standard deviations for the two groups shown in the table.

Control Group Antiplaque Group

Sample Size 8 8

Mean 1.29 0.78

Standard Deviation 0.37 0.37

Do the data provide sufficient evidence to indicate that the oral antiplaque rinse is effective? Test using= 0.05.

State the test statistic. (Round your answer to three decimal places.)

t=_______

State the rejection region. (If the test is one-tailed, enter NONE for the unused region. Round your answers to three decimal places.)

t> ______

t<_______