What statistical tests should a researcher use, and why?

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A researcher has investigated the relationship between IQ and grade point average (GPA) and found the correlation to be .75.

Oct 18th, 2017

correlation = 0.75..........
if corelation lies between 0.7 to 1, it is basically regarded as positively strong.
correlation between gpa and iq is strong and if iq level increases, gpa level also increases.
Not only iq level is responsible for gpa level. there are others factors also like performance, education level etc. so these variables might have influence on the relationship.
correlation only shows relation -strong or week, it can't use to quantify the outcome. for example if iq level will be increase by x(say), then how much gpa level will increase?.. S o for this regression (causation)is needed.

sample size, standard deviation etc are factors that affects the size of correlation.
to predict gpa, regression is needed because there are others factors that affects gpa.


Jan 13th, 2015

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