OSR magazine reports on the largest quick-serve and fast-casual restaurants in the United States. There are various market segments (burger, chicken, sandwich, and pizza) and their corresponding sales per unit in the sample dataset FastFood.csv.

At the 0.05 level of significance, after performing ANOVA to find the evidence of a difference in the mean sales per unit among the food segments, what is the 'mean_sq' of the 'Residual'?

9.750783e+06

923886.427222

2.771659e+06

487539.152833