ISA How Science Work questions 0.0 / 5 ? BiologyPractical applications of biologyASAQA Created by: Megan PickardCreated on: 23-03-14 17:13 What is the importance of Control Variables? To make sure only one factors effects is observed. 1 of 8 Why do you need a control group? They are used to make a comparison with those that have the independent variable effecting them. 2 of 8 Why should you use a large sample size? To gain more reliable data. 3 of 8 How do you collect data carefully? They are grouped randomly to avoid bias. 4 of 8 Why do you repeat measurements? To spot anomalous data so it can be removed before a mean is calculated. 5 of 8 How many repeats should you do? Usually 5 or until concordancy occurs. 6 of 8 Because correlation occurs does it mean the two variables are linked? No, correlation does not mean causation. 7 of 8 Why do you calculate percentage change? It allows you to have different mass numbers in the starting group. 8 of 8
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