Independent random samples of 6 advertisements were taken from three different magazines: EuroScientist, Focus, and Science Reporter. The fog indices, measuring the reading difficulty of a written text, were taken and are given in the accompanying table. For the one-way analysis of variance model, we write the jth observation from the ith group as

where m is the overall mean, Gi is the effect specific to the ith group, and eij is a random error for the jth observation from the ith group.

a. Estimate μ.
b. Estimate G_i for each of the three magazines.
c. Estimate ε₁₃, the error term corresponding to the thrid observation (10.65) for EuroScience.

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Xij = μ + G₁ + Eij