Maths Skills 2 (OCR A-Level Biology A): Flashcards
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Practise the cards
10 cards from this deck
Independent variable
Independent variable
Variable deliberately manipulated; plotted on x-axis
Dependent variable
Dependent variable
Variable measured in response; plotted on y-axis
Controlled variable
Controlled variable
Variable kept constant throughout investigation
When to use logarithmic scales
When to use logarithmic scales
When data covers extremely wide range (orders of magnitude)
Continuous vs discrete data
Continuous vs discrete data
Continuous: any value; discrete: whole numbers only (counted)
Standard deviation (SD)
Standard deviation (SD)
Quantifies spread/dispersion of data around the mean
SEM formula
SEM formula
SD/√n (SD divided by square root of sample size)
Chi-squared test purpose
Chi-squared test purpose
Compares observed vs expected categoric data (goodness-of-fit)
Spearman's rs values
Spearman's rs values
+1=perfect positive; -1=perfect negative; 0=no correlation
Correlation limitation
Correlation limitation
Correlation does not prove causation