Does a bigger cast make a better movie?

Movies grouped by how many actors are credited, in order of cast size rather than ranked. Avg. rating is the average of the group's movies, adjusted for how strictly each user rates.

Cast	Movies	Ratings	Raw avg.	Avg. rating
4-6 actors	66	90	6.51
7-10 actors	162	204	6.44
11+ actors	852	976	6.61