A researcher in the field of educational psychology is interested in the effects an open classroom has on intellectual development.. An elementary school in her district switched to an open classroom format last year, and she is interested to see how this has impacted on the kids problem-solving skills. She obtains a random sample of 27 fourth grade children and administers a conceptual problem-solving test to them. It is known that fourth graders in traditional classes have an average score of 82 on the test. The children in this study score an average of 86 with a standard deviation of 5. Use 0.05 level of significance. The computed statistical tools value is?