How science works 0.0 / 5 ? BiologyHSWASAQA Created by: Katie ElliotCreated on: 25-02-15 17:51 What is the independent variable? Changed Variable 1 of 15 What is the dependent variable? Measured variable 2 of 15 Why could there be a control investigation? To show independent variable is causing effect 3 of 15 What is range? Highest and Lowest with units 4 of 15 Why do we repeat experiments? Improve reliability, Reduce chance of anomalies, Provides mean 5 of 15 How do we know if results are reliable? Not scattered on a graph (obvious trend), Large sample size, Another scientist conducted experiment and has same results 6 of 15 What do scatter graphs show? Positive, Negative or No CORRELATIONS 7 of 15 What is standard deviation? Gives information about Spread About The Mean. small sd= little variation about the mean 8 of 15 Why do we carry out stats tests? See if there is a Signifcant Difference due to change (between data) To see how well results support hypothesis 9 of 15 Why is data often shown as %? It's easier for Comparison (always use an example in text) 10 of 15 What if data is given as 'per 1000'? It's easier for Comparison 11 of 15 How reliable is data from questionnaires? Not very! People often lie or go for the middle and give answer they think they should. UNRELIABLE 12 of 15 What is a placebo? Drug withoutactive ingredient, but looks, tastes and packaged same as experimental drug 13 of 15 What is a double blind study? Neither groups of patients OR Medical professionals know what group has placebo. This reduces effects of bias 14 of 15 Why should we back up results with research from secondary resources? Experimenter could be bias 15 of 15
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