Validity

Question 1

How can validity of results be shown?

Answer 1

• statistical test
  
  • e.g. T-test
• repeats
• controls
• specify variables
• does method include all vairables
• bias

Question 2

What is validity?

Answer 2

does the data show what it is meant to show

Question 3

What should be commented on when considering the validity?

Answer 3

• limitations
• uncrontrolled variables
• errors
• repeatability
• preceision
• accuracy

Question 4

What are systematic and random errors?

Answer 4

• systematic
  
  • same throughout the experiment
  • e.g. faulty equipment
  • incorrect by same quantity
  • data precise but not accurate
• random
  
  • do not carry out the procedure in exactly the same way each time
  • may read apparatus slight away
  • affect some results but do not all

Question 5

wHAT Are repeatable and reproducable results?

Answer 5

• repeatable
  
  • replicate results in close agreement
• reproduiceable
  
  • done by someone else, who follows the same proceudure using the same equpment, but at a different time and palce