Key points are not available for this paper at this time.
Thomas L. Good, Ricky L. Slavings, Kathleen Hobson Harel, Hugh Emerson, Student Passivity: A Study of Question Asking in K-12 Classrooms, Sociology of Education, Vol. 60, No. 3 (Jul., 1987), pp. 181-199
Good et al. (Wed,) studied this question.