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what graph used in correlation
scattergraph
explain why scattergraph appropriate to use for correlation data
the study is correlation / looks at relationship between 2 co-variables
scattergram display relationship between 2 co - variables
why is it not appropriate for researcher to conclude causation in co variable
correlation only shows relationship between 2 co- variavles
researchers conclusion implies causation
however :
no manipulation of Independent variable in correlation → cause and effect cannot be established
third (untested) variable could be responsible for the relationship/ correlation between co- variables
how to calculate correlation co-efficient
use inferential test eg Pearson r ( for interval data) or spearman’s rho
what type of hypothesis is positive/ negative correlation
1 tailed / directional hypothesis