LIFE SCIENCES-GRADE 12 STRUCTURE, CONTROL & PROCESSES PRACTICAL HYPOTHESIS TESTING: Investigating an individual's reaction time to a stimulus. Questions: Formulate a hypothesis for your investigation. 1. 2 2.1 2.2 Identify the: Independent variable dependent variable. Length of ruler (2) List TWO variables that should be kept constant in your investigation. (2) ( 3. 4. Describe TWO ways that your experimental design ensures the reliability of your results. (2) 5. Draw the completed results table in your answer sheet. (5) 6. Construct a bar graph using the average distance travelled in mm per individual. ( 7. Use your graph to determine which individual had the fastest reaction time. (1) 8. Mention TWO other factors, not mentioned above, that might affect (2) 9. an individual's reaction time to a stimulus lack of focus / not In this investigation, name the following: the stimulus 9.1 9.2 the receptor eyes 9.3 the part of the brain involved 9.4 the effector cerebellun 10. Write down the conclusion for your investigation. (Note that the uld be related to the aim and hypothesis of the attens (4)​