A group of students design an experiment to measure reaction times using a computer-based visual stimulus. When a red screen turns green, each student must press the spacebar as quickly as possible.
The table shows the reaction times in seconds for ten students tested with their dominant hand and their non-dominant hand:
| Student | Dominant hand reaction time (s) | Non-dominant hand reaction time (s) |
|---|---|---|
| 1 | 0.19 | 0.24 |
| 2 | 0.21 | 0.25 |
| 3 | 0.18 | 0.24 |
| 4 | 0.22 | 0.28 |
| 5 | 0.20 | 0.25 |
| 6 | 0.21 | 0.27 |
| 7 | 0.19 | 0.25 |
| 8 | 0.23 | 0.26 |
| 9 | 0.21 | 0.29 |
| 10 | 0.20 | 0.26 |
Find the mode of the reaction times for the dominant hand.
Calculate the median of the reaction times for the dominant hand.
Identify the stimulus in this reaction time test.
Complete the sequence representing a reflex arc for this response:
Stimulus→I→Sensory neurone→Central Nervous System (CNS)→II→Effector→Response\text{Stimulus} \rightarrow \text{I} \rightarrow \text{Sensory neurone} \rightarrow \text{Central Nervous System (CNS)} \rightarrow \text{II} \rightarrow \text{Effector} \rightarrow \text{Response}Stimulus→I→Sensory neurone→Central Nervous System (CNS)→II→Effector→Response
State the names of structures I and II.