A sample of n = 9 participants is obtained from a population with participants are as follows : 23 , 33 26 , 28 , 30 , 26 , 27 , 25 , 25 and a treatment is administered to the individuals in the sample . After treatment , the scores for the nine a Are the data sufficient to conclude that the treatment has a significant effect ? Use a two - tailed test with a SO^ prime =Y . Are the data sufficient to conclude that the treatment significantly decreased scores ? Use a one - tailed test with a = .