For the data in Table 9.1, the ANOVA F test and Welchs test were not significant with = 0.05. Imagine that you want power

For the data in Table 9.1, the ANOVA F test and Welch’s test were not significant with α = 0.05. Imagine that you want power to be 0.9 if the mean of one of the groups differs from the others by 0.2. (In the notation of Section 9.3, a = 0.2.)

Verify that according to the R function bdanova1, the required sample sizes for each group are 110, 22, 40, and  38.

The data are stored in the file skin dat.txt on the author’s web page. Note that the file has labels in the first line and values are separated by &.