evaluate the effect of a treatment, a sample is obtained from a population with a mean of =25, and the treatment is administered to the individuals in the sample. After treatment, he sample mean is found to be M=27.4 with SS=64. If the sample consists of 9 individuals, vhat is the t statistic (__), and are the data sufficient to conclude that the treatment has a ignificant effect using a two-tailed test with a=.051(__) ?
a. t=2.55; no
b. t=2.28; yes
c. t=2.28;no
d. t=2.55; yes