~~A sample of size n=19 is selected from a population with mean 50. After a treatment is administered to the individuals in the sample, the mean is found to be M = 55 and the variance 64. Are the data sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with a 5% significance level. Be sure to state your test statistic and either the critical value or the p-value to support your answer.