Development of Practical skills in Biology

Question 1

How can you increase reliability in an experiment?

Answer 1

• Using a larger sample
• Repeat to find a mean and spot anomalies
• Have a control group
• Do a statistical test

Question 2

How can you increase validity in a practical?

Answer 2

• keep all the variables in the sample the same
  e.g. temp, pH, conc

Question 3

How can you increase accuracy in an experiment?

Answer 3

• use a ruler, pipette, syringe
• use intermediate values / a range of temp, pH
• for microscope or sampling animals : take photos to not repeat counting