HomeoStasis: Praticle~ Reaction time.

Question 1

What is the method for this practicle?

Answer 1

• We need 2 people, Person 1 and Person 2.
• Person 2: Measures reaction time of person 1.
  1) Person 1 sits on a stool with good upright posture.
  2) Person 1 places forearm of their dominant arm across the table with their hand overhanging the edge.
  3) Person 2 holds a ruler vertically and the 0cm mark should be between persons 1 thumb and first finger.
  4) Person 2 drops the ruler at a random time and person 1 has to catch the ruler as quickly with their thumb and first finger.
  5) Person 2 records the measurement on the ruler that is above Persons 1 thumb.
  6) Person 1 has a short rest and this is repeated multiple time to find the mean and we can use a conversion table.
  Two people switches.
• allows us to see if 2 people have different reaction times.

Question 2

What is the independent variable?

Answer 2

• Changed.
• Person having their reaction time tested.
• Effect of a person practice.
• Depends on the hand used.
• Chemicals.
  Problem: Could be additional chemicals which may affect the reaction time.
• As chemicals could have something we need to check the person if they have any medical issues.

Question 3

What is the dependant variable?

Answer 3

• Variable that is measured.

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Question 4

What is the control variable?

Answer 4

• Variable that you keep the same.
• Starting distance between the thumb and first finger should be constant.
• Always measure the ruler at the top of the thumb.
• Keep the conditions of the classroom the same.
• E.g: Lighting and background noise.
• As this could affect our dependant variable.