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3. Firstborn children tend to develop language skills faster than their younger siblings. One possible explanation for this phenomenon is that first-borns have undivided attention from their parents. If this explanation is correct, then it is also reasonable that twins should show slower language deveIOpment than single children and triples should be even slower. Davis (1937) found exactly this result. The following hypothetical data demonstrate the relationship. The dependent variable is a measure of language skill at age 3 for each child (high scores indicate better language skill) pe of rst-born d. Compute effect size (eta squared) by hand and indicate what it means in this context (2). e. Conduct a post hoc test using the Tukey test and be sure to include pair-wise comparisons (3). f. What is your conclusion? Report the results of the post hoc test as well. Be sure to include the direction of the difference (You don't have to write a detailed report like I did, but report/interpret what you found) (3 pts)