Table 3.
Number and proportion of attempts, Conditions 1 – 3, for each subject in which the long axis of the stick was aligned with the long axis of the groove. Each subject’s overall proportion (Conditions 1 – 3 combined) is compared to the number expected by chance+ and the probability of the observed distribution, as evaluated with the Chi Square test (df=1).
| SPECIES | SUBJECT | CONDITION | # ATTEMPTS ALIGNED / TOTAL |
PROPORTION ALIGNED |
# EXPECTED BY CHANCE |
CHI- SQUARE |
ODDS RATIO |
|---|---|---|---|---|---|---|---|
| PAN | Lana | 1-3 1 2 3 |
151 / 396 | 0.38 0.44 0.31 0.41 |
99 | 36.42*** | 1.85 |
| Mercury† | 1-3 1 2 3 |
90 / 428 | 0.21 0.23 0.20 --- |
107 | 3.60 | ||
| Panzee | 1-3 1 2 3 |
178 / 370 | 0.48 0.33 0.43 0.52 |
93 | 105.37*** | 2.76 | |
| Sherman | 1-3 1 2 3 |
87 / 261 | 0.33 0.09 0.36 0.35 |
65 | 9.65*** | 1.51 | |
| SUM | 1-3 | 506 / 1455 | 0.35 | 364 | |||
| CEBUS | Chris | 1-3 1 2 3 |
381 / 1033 | 0.37 0.31 0.38 0.37 |
258 | 119.41*** | 1.76 |
| Leo | 1-3 1 2 3 |
152 / 399 | 0.38 0.33 0.41 0.38 |
100 | 11.43*** | 1.84 | |
| Nick† | 1-3 1 2 3 |
114 / 226 | 0.50 0.58 0.48 |
57 | 78.02*** | 3.02 | |
| Solo | 1-3 1 2 3 |
157 / 383 | 0.41 0.58 0.44 0.37 |
96 | 52.22*** | 2.08 | |
| Xenon | 1-3 1 2 3 |
173 / 407 | 0.43 0.50 0.38 0.46 |
102 | 66.64*** | 2.21 | |
| SUM | 1-3 | 977 / 2448 | 0.42 | 612 |
+
chance is 1 alignment per 4 attempts = 0.25
†
Mercury and Nick completed no trials in condition 3
***
P< 0.001