In a study of memory process, rats were first presented with afear-inducing stimulus on a learning task as soon as they steppedacross a line in a test chamber. Afterwards, the rats were dividedand given electrical stimulation either 50 or 150 millisecondsafter crossing the line. In addition, the rats differed in terms ofthe area in which the stimulation electrodes were implanted intheir brains (Neutral Area, Area A, or Area B). Researchers wereinterested in the time it took the animals to re-cross the line ona subsequent learning task. The idea is that stimulation of certainareas in the brain would interfere with memory and hence delaylearning to avoid the line on the subsequent learning task. Thedata on time to re-cross the line are below. What can be concludedwith an ? of 0.05?
Area
| Time | neutral | A | B |
|---|
| 50 | 26
31
29
41
21 | 12
19
25
16
15 | 24
18
19
29
24 |
| 150 | 26
29
24
18
33 | 26
31
38
30
24 | 27
20
29
29
22 |
Time: test statistic =
Area: test statistic =
Interaction: test statistic =
Compute the corresponding effect size(s) and indicatemagnitude(s).
Time: ?2= ; ---Select--- na trivial effectsmall effect medium effect large effect
Area: ?2= ; ---Select--- na trivial effectsmall effect medium effect large effect
Interaction: ?2= ; ---Select--- na trivial effectsmall effect medium effect large effect
