A marine biologist conducted a study to investigate if sea otters demonstrate greater dexterity when using tactile-release puzzle feeders compared to lever-pull puzzle feeders. An independent measures design was used to test 12 sea otters, with 6 otters randomly assigned to each condition. The time and accuracy of their interaction with the puzzles were evaluated on a standardized dexterity index with a maximum score of 40.
| Dexterity index score (max 40) under two puzzle feeder conditions | |||
|---|---|---|---|
| Type A (Tactile-release) | Type B (Lever-pull) | ||
| Otter | Dexterity score | Otter | Dexterity score |
| 1 | 32 | 7 | 18 |
| 2 | 28 | 8 | 24 |
| 3 | 36 | 9 | 16 |
| 4 | 30 | 10 | 22 |
| 5 | 34 | 11 | 16 |
| 6 | 26 | 12 | 24 |
Calculate the mean percentage score on the dexterity index for each puzzle feeder condition. Show your workings.
