A study reported in the Journal of Research and Development in Education evaluates the effectiveness of social skills training and cross-age tutoring for improving academic skills and social communication behaviors among boys with learning disabilities. Twenty boys were divided into three groups, and their scores on the Test of Written Spelling (TWS) can be summarized as follows.

Calculate the entries of the ANOVA table using these results.

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TWS Mean St. Dev. Group 2 Social skills training and 21.43 20.00 20.83 9.48 8.91 9.06 utoring components Social skill training only7 Neither component