The following data were obtained from an independent-measures study comparing three treatment conditions. I n 5 6 M 5 1 SS 5 60 Treatment II n 5 6 M 5 2 SS 5 65 III n 5 6 M 5 6 SS 5 40 N 5 18 G 5 54 SX2 5 411 a. Calculate the sample variance for each of the three samples. b. Use an ANOVA with a 5 .05 to determine whether there are any significant differences among the three treatment means. (Note: In the ANOVA you should find that MSwithin is equal to the average of the three sample variances.)