In: Statistics and Probability
A developmental psychologist who wanted to know if children who started walking earlier performed better in school divided 30 children into Early, Middle, and Late Walkers. At the end of the second grade, the psychologist computed a composite performance score based on teachers' reports and found no overall difference between the groups: Early M = 2.94 (SD = .61); Middle M = 2.84 (SD = .70); Late M = 2.77 (SD = .64); F (2, 27) = .86, p = ns. Interpret this finding for a person who understands the t test for independent means but who is unfamiliar with the analysis of variance.