# Data obtained from the # Hopkins&Glass textbook. Their description is # "Harrington (1968) experimented with the order # of 'mental organizers' that structure the # material for the learner. A group of 30 persons # were randomly split into three groups of 10 each. # Group I received organizing material before # studying instructional material on mathematics; # Group II received the 'organizer' after studying # the mathematics; Group III received the math # materials but no organizing materials. Scores # are from a 10-item mathematics test on the # instructional content. # The data are in stacked" form (each row is a student). score orggrp 01 5 1 02 4 1 03 6 1 04 2 1 05 2 1 06 2 1 07 6 1 08 4 1 09 3 1 10 5 1 11 4 2 12 5 2 13 3 2 14 6 2 15 6 2 16 3 2 17 3 2 18 4 2 19 4 2 20 2 2 21 5 3 22 4 3 23 4 3 24 7 3 25 8 3 26 7 3 27 6 3 28 4 3 29 4 3 30 7 3