A study of computer-assisted learning examined the learning of "Blissymbols" by children. Blissymbols are pictographs (think of Egyptian hieroglyphs) that are sometimes employed to help learning-impaired children communicate. The researcher designed two computer lessons that taught the same content using same examples. One lesson needed the children to interact with material, while in the other the children controlled only the pace of lesson. Call these two styles "Active" and "Passive." Children were assigned at random to Active and Passive groups. After the lesson, the computer presented a quiz that asked the children to identify 56 Blissymbols.
Here are the numbers of correct identifications by the 24 children in the Active group:
29 28 24 31 15 24 27 23 20 22 23 21
24 35 21 24 44 28 17 21 21 20 28 16
The 24 children in the Passive group had these counts of correct identifications:
16 14 17 15 26 17 12 25 21 20 18 21
20 16 18 15 26 15 13 17 21 19 15 12
SOLVE: What is the test statistic? Give your answer to two decimal places