13. Suppose the research study in the previous problem produced larger variances of s 2  27 and s 2  21 for the two samples. Assuming that the means and sample sizes are the same as in problem 12, are the data sufficient to conclude that there is a significant difference between the two treatments? Use a twotailed test with  .05. Note how larger variances affect the outcome of the hypothesis test. (Again, the two samples are the same size, so the pooled variance is simply the average of the two sample variances.)