Affiliation: | (1) Concordia College, St. Paul, Minnesota, 55105;(2) Department of Educational Psychology, University of Nebraska-Lincoln, Lincoln, Nebraska, 68588;(3) Department of Mathematics, University of Nebraska-Lincoln, Lincoln, Nebraska, 68588;(4) Department of Physics, University of Nebraska-Lincoln, Lincoln, Nebraska, 68588;(5) Center for Curriculum and Instruction, University of Nebraska-Lincoln, Lincoln, Nebraska, 68588-0355 |