14.9

(a) Plot the performance curves for each group.

(b) Perform the ANOVA, including a complete trend analysis. Discuss the results in terms of the plot in part (a).

(a) For the Ex14_8 data set, calculate the .95 simultaneous confidence intervals on the pairwise differences among diet means (averaging over the 4 days), using Tukey's HSD (1953) procedure. Report any significant differences.

(b) After inspecting the data, the researcher notes that diet C yields better performance than A or B on day 4. Calculate a confidence interval for the difference between that mean and the average of the other two means, taking into consideration the fact that the test is post hoc (FWE-.05). Is the difference significant? We have two groups (41, 42) of four subjects each. Each subject is tested six times with