13.15 Influence of age and sex on motor performance, continued. Refer to the previous exercise.

  1. (a) In their article, the researchers state that each of their response variables was assessed for Normality prior to performing a two-way ANOVA. Is it necessary for the 246 time measurements to be Normally distributed? Explain your answer.

  2. (b) Is it reasonable to pool the variances?

  3. (c) Suppose for these data that SS(sex) = 44.66, SS(age) = 31.97, SS(interaction) = 13.22, and SSE = 280.95. Construct an ANOVA table and state your conclusions.