Planning an experiment

Question 1

precise

Answer 1

dont vary much from mean

Question 2

WHat reduces [recision

Answer 2

random error

Question 3

repeatable

Answer 3

• same person repeats the experiment using the same methods and equpment, they will get the same results

Question 4

reproducable

Answer 4

• someone different does the experiment, using a slightly differnet method or piece of equpiment, the results will still be the same

Question 5

valid

Answer 5

• valid results answer the original question
• need to control all variables

Question 6

accurate

Answer 6

• close to true answer

Question 7

what results accuracy

Answer 7

human interpretation

Question 8

independant variable

Answer 8

change

Question 9

dependant variable

Answer 9

measure

Question 10

why are all other variables controlled

Answer 10

so only the independant variable is affecting the depeendent varaible

Question 11

negative controls

Answer 11

• check only independant is affecting the dependent
  
  • aren’t expected to have any effect on experiment

Question 12

why mare repeats used

Answer 12

• calc mean
• reduces effect of random error
• results more precise
• repeatable and reproducible