# 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