22. A developmentoal psychologist is examing the development of language skills

Question

22. A developmentoal psychologist is examing the development of language skills from age 2 to age 5. Four different groups of children are obtained, one for each age, with n = 15 children in each group. Each child is given a language skills assessment test. The resulting data were analyzed with an ANOVA to test for mean differences between age groups. The results of the ANOVA are presented in the following table. Fill in all missing values.

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Source SS df MS
_____________________________________________________________
Between Treatments 81 ____ ____ F = ____
Within Treatments ____ ____ ____
Total 249 ____
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Explanation / Answer

SS Between 81 Within 168 Total 249 DF Between 3 (number of groups minus 1) Within 56 (number of participants minus number of groups) Total 59 MS Between 27 (SS/DF) Within 3 (SS/DF) F statistic 9 (MS between/MS within)

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