Correlations Notes - AS OCR Psychology Unit 1

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Psychology Notes Correlation
Correlations are used to measure the relationship between two variables.
Positive Correlation ­ As one variable increases, so does the other, although not necessarily
at the same rate
Negative Correlation ­ As one variable increases, the other decreases, although not
necessarily at the same rate
Zero Correlation ­ When there is no relationship between two variables
Correlations can be used when it would be unethical or impractical to conduct an experiment
Is there is a significant correlation then further research is justified
Casual relationships may be ruled out if the correlation is insignificant
Correlations may be misinterpreted and assumptions of a cause and effect relationship can
be made ­ but this is not the case NO CAUSE AND EFFECT
There may be other, unknown variables that may explain the links between the covariables
Extraneous variables may lead to false conclusions
Scattergraphs
· A graph that shows the correlation between two sets of data (covariables)
· The extent of correlation is valued between 1 and +1 (correlation coefficient)
· 1 = perfect negative correlation, +1 = perfect positive correlation, 0 = no correlation
Allows the data to be analysed visually

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