Question 8 0.5 pts Forty-five participants (15 per group) were randomly assigned to do a series of math tasks while listening to soft-gentle music, while listening to loud-intense music, or while in silence. The means and estimated population variances for the three groups were: Soft-Gentle: M = 37, $7 - 28; Loud-Intense: M = 33, $2 = 25; Silence: M = 41, $2 = 22. Using the .05 significance level, is there a difference in performance on this kind of math task under these three conditions? If there is a planned contrast between the soft gentle and silence group (using the .05 level, what is the $2 within