Question: The sociability of first-grade children who attended preschool is compared to the sociability of first-graders who did not attend preschool. There are 15 first-graders who attended preschool, and they have a mean sociability score of 17, with a standard deviation of 2. There are 16 first-graders who did not attend preschool, and their mean is 14, with a standard deviation of 3. Is there a significant difference between the two groups using alpha level of .05 and a two-tailed test?